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Antec Kühler H2O 620 Liquid Cooling System E-mail
Reviews - Featured Reviews: Cooling
Written by David Ramsey   
Thursday, 10 February 2011
Table of Contents: Page Index
Antec Kühler H2O 620 Liquid Cooling System
Closer Look: Antec Kuhler H2O
Antec Kuhler Detailed Features
Heatsink Test Methodology
Testing and Results
Final Thoughts and Conclusion

Liquid Cooler Final Thoughts

After Corsair's H50 hit the market, its success led to many other companies offering their own variations on the theme, if by "variations" you mean "label". Even Corsair's own H70, with its double-thickness radiator, is simply a version of Asetek's LC570 OEM cooler.

Antec's Kühler H2O 620 is (so far) unique: it's not listed as an OEM product by Asetek and Asetek posts no specifications on it, instead merely providing a link to Antec's product page. And as is depressingly standard in this market segment, technical information like pump flow rate and fan airflow are missing, so while I think the thicker hoses mean more water flow, I don't know if that's the case.

But what I do know are the performance figures I got in my testing, which place the Kühler solidly in the lead of all other all-in-one water coolers that I've tested. Frankly its performance is almost unbelievably good: its stock-fan performance is 7.2 degrees cooler than Corsair H50, whose radiator appears to be identical. With the high-speed Delta fan on both coolers, the performance gap widens to 9.4 degrees. I can't come up with any explanation other than increased flow rate, but in the end that's really irrelevant, as the performance speaks for itself. Its only competitor in the all-in-one water cooling market is the Corsair H70, which achieves similar stock-fan performance with its thicker radiator and dual fans. However, the H70 is both noisier and significantly more expensive than Antec's Kühler.

In previous reviews I've noted how rapidly the CPU cooler market was advancing, with new designs and new performance benchmarks appearing so frequently that it was hard to keep up. We seem to be approaching an asymptote, though: the size of air coolers is reaching the constraints imposed by standard computer cases, and performance is leveling off. Since any retail CPU is shipped with a perfectly good CPU cooler in the box, you might think that the only reason to purchase an aftermarket cooler is performance. While this is certainly the primary consideration, there are others, such as acoustics (how loud the cooler is) and aesthetics (for windowed cases). Also, bear in mind that not every cooler works in every situation: top-performing air coolers tend to be both large and expensive, and are overkill for all but the hottest, most overclocked systems. There's room in the market for many different types of coolers, and the best solution for you is probably not the best solution for me.


Priced to compete with high-end air coolers, the Kühler offers similar performance and a lower noise level. It's the first compact liquid cooler I've tested that can honestly be considered as competition for the likes of the Cooler Master V6 GT, Prolimatech Megahalems, and Thermalright Venomous X.

Antec Kühler Conclusion

Please remember that these test results reflect our experience with each cooler on a specific motherboard, with a specific processor, BIOS revision, BCLK and voltage settings, and test programs. The results of this test cannot be directly compared to other tests since many factors will have changed.

Installing the Kühler is easier than most other compact liquid coolers due to the flexibility and length of its soft rubber hoses. The "universal" Intel backplate (on AMD systems, the stock motherboard backplate is used) keeps the parts count (and price) down, and while I prefer the more robust mounting system design of Asetek's original systems, the current mounting system certainly doesn't seem to affect the performance.

The performance of the Antec Kühler H20 620 was excellent, exceeding that of every other water cooler I've tested and encroaching on the performance range of the very best air coolers. The stock fan is quiet at full speed and very quiet at low speed. I tried replacing it with an 88CFM fan, which generated more perceived air flow and certainly more noise, but actually slightly less performance. It's not clear if just any 3-pin fan will work with Antec's unique fan speed control system, and it would be nice to see some information from Antec on this.

The construction quality of the Kühler was similar to that of other Asetek-sourced water coolers, which is to say that everything fit and worked correctly and the swivel mountings for the hoses pivoted freely. Antec silk-screens their logo on the pump housing and puts an "Antec" sticker on the fan's hub, but that's it as far as decoration goes. I'd like to see a little more effort expended on aesthetics.

But I'm not going to get hung up on the Kühler's minimalist aesthetic. The Antec Kühler H2O 620 is the best-performing water cooler I've tested, and that's why it gets a Golden Tachometer award. As of March 2011, the Antec Kühler 620 is available at Amazon for $81.

Pros: Benchmark Reviews Seal of Approval

+ Priced at the bottom of the range for coolers of this type
+ Integrated fan speed controller varies fan speed as required
+ Very quiet, even at full fan speed
+ Astonishing CPU cooling performance
+ Maintenance-free liquid-cooling system


- Pump mounting system seems insubstantial
- Cannot expand the system with chipset or GPU coolers
- Specifications for the pump and fan seem to be secrets


  • Performance: 9.75
  • Appearance: 8.25
  • Construction: 9.25
  • Functionality: 9.25
  • Value: 9.75

Final Score: 9.25 out of 10.

Excellence Achievement: Benchmark Reviews Golden Tachometer Award.

Is the Antec Kühler H2O 620 on your shopping list? We invite you to comment below or start a discussion in our Forum.

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# Radiator upside down?Dave Corneille 2011-02-09 22:55
I noticed that the feed lines to the radiator were at the top of the radiator in the installed pic near the begining of the article.

Are they not supposed to be mounted so they are at the bottom of the radiator? The cooler water is at the bottom and having the feed and pickup at the bottom precludes the chance that the pump is pulling against an air bubble at the top.

I have handled one all-in-one system some time back and seen to remember that bottom orientation was specified.
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# RE: Radiator upside down?David Ramsey 2011-02-10 07:46
The Kühler installation instructions don't specify a radiator orientation...and neither do the instructions of any other water cooler I've tested. They're all quite specific about how to orient and install the fans, though...
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# RE: RE: Radiator upside down?jessie lawrence 2011-02-10 11:31
Orientation of the radiator does not affect performance in any measurable way. At times, the chassis will dictate orientation but if it doesn't, you can install the unit whichever way fits your system best.
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# Silk-screened logo?Shakey 2011-02-10 02:42
So what happened to the LED logo? Antec seemed just as proud of the customisable LED as the rest of the cooler.

Looks like I'm rubbing the branding off of mine then...
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# RE: Silk-screened logo?David Ramsey 2011-02-10 07:40
What L.E.D. logo? There's nothing like that mentioned in the Kuhler announcements I've seen...
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# Internet Marketing Managerjessie lawrence 2011-02-10 08:10
The customizible LED is a feature that is specific to the KUHLER H2O 920 that we showed at CES. More details on that product will be coming in the near future.
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# RE: Internet Marketing ManagerShakey 2011-02-10 08:40
Ah OK - I thought it was on the 620 too.
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# RE: Antec Kühler H2O 620 Liquid Cooling SystemServando Silva 2011-02-10 08:29
Great Review David.
I didn't expect the H20 620 to perform better than the H70. In the future, would it be possible to get a pair of Scythe GT 1850rpm for heatsink and radiator tests?
They're considered the best fans in many extreme forums as they have great pressure even with low CFM.
Take care.
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# RE: RE: Antec Kühler H2O 620 Liquid Cooling SystemDavid Ramsey 2011-02-10 09:00
I didn't expect it to, either, but bear in mind that (as always) Your Mileage May Vary. It's hard to compare these coolers directly given the H70's double-thick radiator. Note that in the stock fan test, the H70 on "High" turned in very slightly better results than the Kühler. The latter won in the high-speed fan test, but as I mentioned in the review of the H70, I think any single-fan setup will be non-optimal with its thick radiator.
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# RE: RE: RE: Antec Kühler H2O 620 Liquid Cooling SystemShakey 2011-02-10 09:04
The 920 should be interesting then.
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# good valueRealNeil 2011-02-10 08:29
$70.00 seems like a good price for this cooler, especially since it's outperforming the Asetek LCLC, and the Corsair H50, that I own right now.
If I was having any problems keeping cool with the cooler that I have now, I'd certainly be interested in this one. If I end up building another system for myself, I'll buy this cooler with better performance and lesser price. Thanks for the review, I love being able to stay on top of news like this without having to go out and buy every new thing, and then test the parts myself.
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# What the?Hammer Computers 2011-02-10 15:15
Why the hell does this one perform so much better than even the H70?! Higher flow pump and/or better "cold plate"?
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# RE: What the?David Ramsey 2011-02-10 15:24
That's an excellent question. As I noted in the review, since we don't have any technical specifications on the pump flow (or much of anything else), all I could do was guess. I'm going with "better flow". Also note my comments that a single, high-speed fan probably isn't the optimum solution for the H70, which likely would have done better with two lower-speed fans.
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# Asetek's responseFrank Lee 2011-02-14 14:06
Asetek recently responded on what some of the differences are.
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# RE: Asetek's responseDavid Ramsey 2011-02-14 15:02
Thanks for the link, Frank. I still wonder about flow rate, though...
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# JakubJakub 2011-09-07 07:22
David, why don't you open up the thing (remove tubes) and measure the flow? The best test is a destruction test so why don't you open the cold plate and see it's interior? I bet that the satin finish is also very important for adhesion of plate to the CPU core.

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# RE: JakubDavid Ramsey 2011-09-07 10:25
I could, but then I've destroyed the cooler and can't use it for future comparison tests.
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# RE: Antec Kühler H2O 620 Liquid Cooling SystemJavk Naylor 2011-02-11 09:14
As an owner of numerous high air flow Antec cases, I can't help but wonder how this much improvement might be gained with two radiators in series, mounted for example on the DF-85's rear fans.

Until now I haven't jumped in to try one of these "faux water cooling setups" as I have called them for several reasons .... 1st the reviews haven't been all that glowing here at BMR, 2nd It looks like a bit of a PITA to inspect the radiator for dust accumulation and 3rd fan and / or pump failure is major surgery.

This unit has my interest but the lack of PWM control is a turn off. It would seem that both the fans a the pump should both be controlled via the MoBo's CPU fan control logic in the BIOS. And without feedback, how would the BIOS know that fan and / or pump isn't spinning ?
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# RE: RE: Antec Kühler H2O 620 Liquid Cooling SystemDavid Ramsey 2011-02-11 09:23
Any water cooling system has the potential to accumulate dust in the radiator, just as any air cooling system can accumulate dust on the cooler's fins. It's a universal problem, but if you install the Kuhler as Antec recommends (fan between the radiator and case back), the radiator's fins are easily accessible: just remove your case side panel and hit the radiator with a spritz of compressed air.

I think Antec's methodology of controlling the fan via the pump, based on coolant temps, is the correct one. Water absorbs much more heat than air, and it takes a while for the water temp to rise appreciably even with a very hot processor. If the fan was controlled by the motherboard, it would ramp up unnecessarily soon.

I do agree with you that a standard PWM fan would be better than Antec's use of a non-PWM fan, which makes the fan-replacement issue cloudy.
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# RE: Antec Kühler H2O 620 Liquid Cooling SystemHammer Computers 2011-02-11 16:35
Is it possible for you have all these types of water coolers gutted? I want to know what they look like inside. Also, my biggest concern weather the pumps are magnetically driven or motor driven.
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# RE: RE: Antec Kühler H2O 620 Liquid Cooling SystemDavid Ramsey 2011-02-11 16:42
I've toyed with this idea. The first thing I'd do would be to cut the hoses and determine which was the input and which was the output; then, I could put the input hose in a large jug or bowl of water and the output hose into a graduated container and measure the flow rate. Also by looking at the cut hoses, I could determine their inside diameter.

Then I could take the pumps apart to inspect the design of the water block and pump motor.

Of course, this would destroy the water coolers and preclude their use in any further articles. Also, while you and I might find the results interesting, what most people are interested in is the performance, which we already know.

One thing that might be interesting is an in-depth test of the water coolers, measuring performance in stock and "mild overclock" scenarios. For this round of tests, I pushed the i7-950 about as far as it would go, which is really outside the parameters of what most of these coolers were designed for. A milder overclock test might be a better real-world indicator of their relative performances.
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# RE: Antec Kühler H2O 620 Liquid Cooling Systemdlb 2011-02-11 23:52
The first set of tests were performed with the 'stock fans' on all coolers (both air and water), but AFAIK, the Thermalright Venomous-X ships w/o any fans, but does include clips for two 120x25 fans. Out of curiosity, which fans were used for the 'stock fans' on the Venomous-X?

Thanks, and this is a great review! Very informative and thorough... BMR is >famous< for quality reviews in my book! (very, very few PSU reviews though, at least recently). Keep up the great work guys!
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# RE: RE: Antec Kühler H2O 620 Liquid Cooling SystemOlin Coles 2011-02-12 06:40
It's the Venomous-X RT, which comes with a fan. Most people don't tack on the RT because that's all they sell anymore.
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# RE: RE: Antec Kühler H2O 620 Liquid Cooling SystemDavid Ramsey 2011-02-12 08:44
Also, the specs on the "stock fan" are detailed on the "Heatsink Test Methodology" page...
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# RE: Antec Kühler H2O 620 Liquid Cooling SystemJack Naylor 2011-02-12 09:48
>if you install the Kuhler as Antec recommends (fan between the radiator and case back), the radiator's fins are easily accessible: just remove your case side panel and hit the radiator with a spritz of compressed air.<

My issue is I couldn't "inspect that is "see it" when sandwiched between the fan so as to require disassembly for inspection. That's a bit of a PITA.
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# RE: RE: Antec Kühler H2O 620 Liquid Cooling SystemDavid Ramsey 2011-02-12 09:53
The radiator isn't sandwiched between anything. Look at the last picture on the "Detailed Features" page. Air goes into the radiator from the case, so the dust accumulation will be right there where you can blow it off.
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# RE: RE: RE: Antec Kühler H2O 620 Liquid Cooling SystemJack Naylor 2011-02-19 00:21
I'm speaking specifically with regard to an installation in an Antec High Air Flow case where the existing case fan is not tossed in the trash. The existing case fan would remain, the radiator installed on top of that and the 620's fan would "make the sandwich".
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# [email protected]David Ramsey 2011-02-19 08:09
Ah, I understand. But you'd have the same problem with any cooler with such a push-pull setup, even an air cooler.
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# RE: [email protected]Jack Naylor 2011-02-21 10:40
It would seem that Antec could really separate themselves here with some modularity. One of my frustrations w/ Antec is they still adhere to Molex only fan connectors in their cases ... quite frustrating when you have a board w/ 3 chassis and 3 optional fan headers. Using even 3 pin fans / connectors in the cases and on the Kuhler would be nice ..... feels weird tossing a perfectly good case fan and replacing it w/ the kuhler's when push - pull could be obtained at no extra cost this way.

This modular approach could be taken further; it would be relatively easy to have a "620D" w/ twin radiator's mounting over the exhaust fan ports on the 1200, DF-85.
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# nice reviewxeno 2011-02-14 04:55
now do the Corsair H60 so i can compare the two before i buy my system ;)
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# RE: nice reviewDavid Ramsey 2011-02-14 07:18
Hey, as soon as Corsair sends us one!
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# Explain pleasePigbristle 2011-02-16 08:31
Is it not more logical to have the outlet (from pump) to the top of the rad, and the inlet (to pump) taken from the bottom of the rad, that way you are using (free) gravity for the water to fall through the rad, instead of using wasted pump pressure having to pump the liquid up to the top of the rad.

Or am I wrong?
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# RE: Explain pleaseDavid Ramsey 2011-02-16 09:09
Theoretically, you're probably right in that you could design a system that could get by with a smaller pump that way. But you don't know in advance how the radiator will be mounted in any given system, so having a system designed for a specific radiator orientation wouldn't be a good idea. According to Antec's comment in this thread, with their current system radiator orientation doesn't affect performance.
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# RE: Explain pleaseJack Naylor 2011-02-19 00:16
No. It's a closed system. Gravity only comes into play in an open system. For example, let's say I have a lake at elevation 300 and I pump outta the lake over a big hill (elev 350) and then pipe runs down hill to a town at elevation 290. Once the pump gets the water to the top of the hill, you can turn the pumps off, water will flow by gravity as the water exiting the pipe at the bottom "sucks" the water up and over the hill. The elevation here is the vertical difference between the inlet and outlet which is 0.
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# RE: Antec Kühler H2O 620 Liquid Cooling SystemPigbristle 2011-02-16 12:50
I would hazard a guess that 99% of buyers are fitting this to the rear exhaust fan outlet. So if they did make the system as I described above, the only other addition needed would be a sticker with the word "TOP" written on it.
I would much rather they did this and have a more efficient system, or, another way of looking at it, the same amount of cooling but the pump running at a slower speed (less wear).
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# RE: RE: Antec Kühler H2O 620 Liquid Cooling SystemDavid Ramsey 2011-02-16 13:01
One thing you may not have considered is that a radiator with inputs and outlets at opposite ends must be a "single-pass" design: that is, the water flows in one end, goes straight through the radiator, and out the far end.

Most computer radiators (including the Kuhler's) are dual-pass: the water goes in, flows through half the radiator tubes, then turns around at the far end of the radiator and flows through the other half of the tubes back to the outlet.

A single-pass radiator benefits from higher flow volume; a dual-pass radiator provides more cooling of the water since it's passing through twice as long a cooling path. You'd normally see single-pass radiators in systems with high-flow-rate pumps (like a Liang D5) combined with dual- or triple-120mm radiators.

While a single-pass design with gravity feed might have slight pumping efficiency benefits, I suspect it wouldn't cool as well as the existing designs.
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# RE: RE: RE: Antec Kühler H2O 620 Liquid Cooling SystemPigbristle 2011-02-16 15:21
Sorry, but a set size rad can only hold a certain amount of pipework (depending on the diameter) whether it is a single flow or double flow.

You seem to be implying, that if something sets off from a set point, stops at 50% of the way, then is more than going 100% of the way. It?s the same distance!

Just with my system, the pump wouldn't have to work as hard.
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# RE: RE: RE: RE: Antec Kühler H2O 620 Liquid Cooling SystemDavid Ramsey 2011-02-16 15:29
You're not thinking this through. Let's say the internal tube length of a 120mm radiator is 110mm. In a single-pass design, the water travels 110mm through the tubes. In a double-pass design, the water travels 110mm from one end of the radiator to the other, then back another 110mm back the other way. While no individual tube is more than 110mm long, the fluid makes two passes the length of the radiator. This is the only reason to have a double flow rad...what would be the point if the fluid didn't travel any further?
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# RE: RE: RE: RE: RE: Antec Kühler H2O 620 Liquid Cooling SystemPigbristle 2011-02-16 16:11
So if we had 10 tubes total in our rad, 5 of those would have to be used for the return jouney in a double pass design.
Where as I would have all 10 tubes being used for one way only, is that correct?
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# RE: RE: RE: RE: RE: RE: Antec Kühler H2O 620 Liquid Cooling SystemDavid Ramsey 2011-02-16 16:16
Exactly. That's where the tradeoff in cooling path vs. flow capacity comes in.

Generally (and YMMV), a double-pass design is better for small rads with small pumps (like virtually all of the all-in-one water coolers), and a single-pass design is better for larger radiators backed by larger pumps.
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# RE: RE: RE: RE: RE: RE: RE: Antec Kühler H2O 620 Liquid Cooling SystemPigbristle 2011-02-16 16:29
I'm glad you agree, So in effect, your hot water is only being fed into 5 cooling tubes, whereas mine is being fed into 10! (I know, but yours goes twice the distance).
So I would say cooling wise we are about equal.

But where my system surpasses yours, is because it is using gravity to flow through the rad where yours is having to use extra pump pressure, to pump the return back, That?s the difference!
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# Please remember conservation of energyFarnsworth Worthington 2011-02-16 17:47
Forgive me, but this water cooler is a closed system. For every climb you can imagine that the water is making against gravity, the water will have a gravity assist on the way back to the pump. That's why Antec states the orientation doesn't matter.

Put another way, there is no net work done in a system where the beginning (water at the pump) is the same point as the ending (back at the pump). There will be losses due to internal friction/heat, but not gravity.
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# RE: Please remember conservation of energyOlin Coles 2011-02-16 18:20
I was wondering how long it would take for someone to point this out. I mentioned this long ago in a video card review:

Sadly, this product never made it to market. :(
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# RE: Please remember conservation of energyPigbristle 2011-02-17 01:44
I think I know what you are saying. On the system I discribe, the fact that the pump would have to feed the top of the rad in the first place(instead of the bottom) means more uphill pumping, so in affect cancels out any advantage it had with its gravity fed bottom outlet?

And when we say "closed system" I take it that means air free?
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# RE: RE: Please remember conservation of energyOlin Coles 2011-02-17 07:41
What is meant by a 'closed system' is that the hoses, pump, block, and radiator are all sealed in a vacuum, so when a drop of liquid goes out another drop is sucked in. This is similar to the principal of modern automotive cooling systems.
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# RE: Antec Kühler H2O 620 Liquid Cooling Systemskeeter 2011-02-26 22:51
I recently bought this cooler for my 1200, antec was great about helping figure out if it would fit or not and where to put it. Basically I had to re-arrange my cages on the front so that one of them was at the very top. I took the rear fan bracket and put the fan that came with the cooler inside of the bracket and screwed it to the rad on the out side of the bracket with the pipes at the top. I doesn't seem to make a difference at all. my temps have dropped by 11 degrees c. on the cpu and 8 on the gpu's. The bracket for the pump seems to be fine, the only complaint I have is that it was a bit of a pain to put together.
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# RE: RE: Antec Kühler H2O 620 Liquid Cooling SystemDavid Ramsey 2011-02-27 08:10
Why did you have to re-arrange the drive cages at the front of the case? Did you mount the radiator/fan assembly there?
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# RE: RE: RE: Antec Kühler H2O 620 Liquid Cooling Systemskeeter 2011-02-27 23:37
Yes I mounted the rad on the back of one of the cages. For my system it was the only place to put it.(at the top)
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# RE: RE: RE: RE: Antec Kühler H2O 620 Liquid Cooling SystemJack Naylor 2011-03-06 14:32
I have the 1200 ... why not remove 1 of the 2 rear fans and place it there ? I'm obviously "missing something".

- 1 top 200mm Big Boy 200? blue LED fan
- 2 rear 120mm TriCool? blue LED fan
- 3 front 120mm blue LED fan
- 1 (optional) side 120mm fan to cool graphics cards
- 1 (optional) middle 120mm fan to cool CPU or graphics cards
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# 1200skeeter 2011-03-06 22:02
if you have a standard atx mobo putting the rad on the back will cover your cpu. Antec recommends putting it on the back of one of the drive cages and putting that at the top of the case.
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# Dual-FansWill 2011-03-06 02:34
I would have liked to see a dual-fan comparison between the H70 and Kühler 620.
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# RE: Dual-FansDavid Ramsey 2011-03-06 07:48
That would be hard to quantify since the Antec's integrated fan controller only supports one fan. You'd have one fan under the control of the cooler, and another running at whatever speed...
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# RE: Dual-FansJack Naylor 2011-03-06 14:49
Methinks they want the 620 to compete with the H50....which is frankly a "no contest" and have the 920 go against the H70. I would seem something has hampered the release of the 920.

Antec doesn't seem to work very hard on integrating its various products. Still use Molex on all their case fans which is quite frustrating when ya have a MoBo w/ 8 fan headers. A fan controller which would control 2 CPU fans (and the pump) as well as their case fans via 3-4 pin fan connectors would be very welcome.
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# RE: RE: Dual-FansWill 2011-03-06 17:58

Thanks for the response. I was not aware the integrated controller only had single fan support. That seems like an odd design decision when most enthusiast cpu coolers are running in push/pull configuration. I'm guessing most overclockers will end up using their own controller which only peaks my interest in a comparison between say, the H60 and the 620 off a secondary controller in p/P.


Yea, I agree there's no contest between the H50/620 but I think a more appropriate comparison would be between the 620 and H60 since the H50 is quickly becoming legacy. And, as I mentioned to David, I have a hard time crowning a clear winner when most people who spend $70+ on a heatsink are not going to run in a sub-optimal single fan configuration.
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# Dual FansJoe 2011-03-28 23:26

I realize this is just speculation but do you think this unit would gain better performance when utilizing an additional fan and instead of exhausting the air out of the case its configured in a push/pull configuration like the H70 where air is moving inside the case from the back?

I ask for a few reasons-this has the block and pump of the H70, with a much thinner rad and bigger rubber tubing for (possibly) better water-flow. A test with a 2nd fan and in a similar configuration as the H70 would be an interesting test.

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# RE: Dual FansDavid Ramsey 2011-03-29 00:09
Joe, adding another fan would improve performance; by how much would depend on the fan and the orientation of the airflow. But testing with non-stock fan configurations would introduce too many variables to be useful in a comparison test.
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# RE: Antec Kühler H2O 620 Liquid Cooling Systemskeeter 2011-03-29 06:47
I am using a push/pull configuration and it seems to work really well!!! I think It would depend on what type of case you are running and where you are putting the rad. I would be willing to send you picks of what I have going on with mine if you like.

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# Can you provide some detailsJoe 2011-03-29 16:38

are you running push/pull directing air in from the back or exhausting out? Also what fans are you running? What temps?

Any details I would love :)
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# RE: Antec Kühler H2O 620 Liquid Cooling Systemskeeter 2011-03-30 07:11

I am running a dual push system on my antec 1200. I mounted the rad on the back of the top cage. Using the extra fan bracket that came with the tower you will need to modify it for the rad to mount. I am using stock fans that came with the tower and the cooler, the fan that came with the cooler runs faster than the tower one but it still seems to be working great! my cpu temps have dropped 12 degrees. The only thing that took time for me to get used to was not having my dvd drive at the top, it now sits in the middle along with the card reader.Again if you would like to see some pics sends me an email and I will be happy to show you what I have done.
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# Fan is loudImadman 2011-04-05 09:11
Just completed a new build using the H2O. Chose to use it based on this review's statement that in addition to it's cooling ability, it is very quiet. I figured why not, my previous rig's 2 12cm fans would be replaced by one - had to be true. No way. I would like to replace the Kuhler fan with one of my quiet ones, but I notice that it has a two pin lead whereas mine has three. Don't know jack about electrical stuff. So could someone please provide some guidance?

Thank you.
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# RE: Fan is loudDavid Ramsey 2011-04-05 10:06
I found the stock fan to be very quiet; I'm surprised it seems noisy to you. As I noted in the review, though, the fan's wiring seems to be unique: only two leads, but with speed controlled by the pump anyway. I don't see how you could replace this fan with another one and retain the automatic fan speed control feature, but one option would be to simply use one of your fans plugged into the power supply or a fan header on the motherboard, and leave the fan leads in the pump disconnected.
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# RE: RE: Fan is loudImadman 2011-04-05 12:09
Do you think if might be possible to remove one of the pins (the right one of course), from the power connector of my fan and make it compatible with the Kuhler?
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# RE: RE: RE: Fan is loudOlin Coles 2011-04-05 12:40
Imadman: these comments are going a little off-topic, so perhaps you should start a thread at to discuss options with photo support.
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# RE: Antec Kühler H2O 620 Liquid Cooling SystemMagno 2011-09-29 19:36
Exhaust vs Intake?
Reading the Antec document regarding mounting the 620 as Exhaust or Intake seems to be proven to me that intake easily wins a few degress. I'm going to mount my system tomorrow putting on a Cooler Master Elite 430 the 620 on rear top as Intake (with dust filter) and having 2 top 120mm Fans to Exhaust the heat introduced by this.

Does any one have any comments to this?
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# Intake vs ExhaustDaasGoot 2012-12-19 13:32
I asked myself this same question.

Here was my train of thought...

In my case, the PSU is at the bottom of the case, drawing air in from within the case and pushing hot air out the back.

The GPU also draws air in from within the case and pushes hot air out the back.

Hot air rises. So.. wouldn't a fan at the top back of the case set as an intake fan pull all the heat that is rising from the exhaust of the PSU and GPU?

I understand the alternative is pulling hot air from inside the case and pushing out the back may not be much different, but if you have a top fan (like i do) you could set that up as intake, which would flow nicely over the board then straight through the radiator(in an exhaust config) and out the back of the case.

thoughts on this?
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# Socket 775 buyer beware!!Lichtywara 2013-02-05 11:08
Bought this cooler on sale for an older quad core box running a 775 solution. The Kuhler box clearly states 775 is supported and all hardware included however none of the 775 brackets were in the box. After researching this I had contacted Antec technical support who stated that a new revision of this cooler was shipped supporting LGA2011 however they opted to maintain the old box and slap a sticker on it. The 775 hardware was no longer included in the box but is NOT documented anywhere. You can identify these boxes as they include a "Supports LGA 2011" sticker stuck to the bottom right side front panel.

In the end, Antec stated they will ship me a "Spare Parts Request" shipment of the missing brackets via US Postal ground service which would take 2 weeks to reach me. It has now been 3 weeks and I have not seen it as yet! I have again opened a new c! ase with Antec quoting the original case however its been 4 days and they still have not contacted me nor do I even know where this shipment is. I was not provided any tracking information originally!

I would advise anyone who is interested in purchasing this product to be very cautious especially if you intend to use this on a socket 775 solution. You will be poorly handled by Antec support and you may or may not receive your shipment as promised by this company. They opt to ship you the parts by the cheapest means possible which is disheartening considering the mistake they had made is inconveniencing to we the consumers.
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# RE: Socket 775 buyer beware!!David Ramsey 2013-02-05 11:08
That sucks. I can understand Antec not wanted to spend the money to ship a bracket set only a minuscule fraction of buyers these days would use, but they at least could have updated the box.
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# RE: RE: Socket 775 buyer beware!!Lichtywara 2013-02-05 11:09
I know I fall into a small subset of users these days that still find use of a 775 quad core machine so I can forgive them for shipping it the way they did.

I cannot forgive how I was treated by them. VIP Support at Antec states that Asetek was responsible for designing the updated units and box and thus they feel it is not their responsibility despite their name being on the box! Then commit to a 2 week shipping time and miss that by 7 days (actually more than that now) makes me angry!

Anyway, I'm glad there are other solutions out there. Zalmann makes some pretty sweet coolers that are decent for overclocking! I'm going to explore those.

Sorry for ranting but thanks for commenting! :)
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