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Intel Sandy Bridge Overclocking Guide E-mail
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Written by Servando Silva   
Tuesday, 19 April 2011
Table of Contents: Page Index
Intel Sandy Bridge Overclocking Guide
Why Should I Overclock?
Overclocking Applications and Utilities
Processor Stability Testing
Understanding OC Variables
UEFI and Testing Methodology
Overclocking Frequency vs. Voltage
Overclock vs. Power Consumption
Overclock vs. Temperatures
Final Thoughts

Overclock vs. Temperatures

Heat is one of the main concerns when overclocking. Some people think they could fry their CPU because of the heat, and that scares them. However, this is far from reality. CPUs and motherboards are so protected that it is almost impossible to burn a CPU by heating it that much. It would be easier to fry your CPU by short circuiting or adding extreme voltage values, but heat isn't normally a problem as components tend to shut down when passing off their limits. However, even if heat isn't that dangerous, it's removal is key for higher and stable overclocks, and that's why Benchmark Reviews covers a lot of CPU heatsinks in our articles. In my tests, I used Noctua's NH-D14 heatsink paired with 2 x NF-P14 140mm fans. Most people won't have this kind of cooling, but the Prolimatech Megahalems or Thermalright Venomous-X should be able to get similar results. Anyway, if you're really aiming at maximum frequencies, you'll need to buy a decent heatsink. If you're stuck with Intel's stock cooler or something similar, chances are that you won't be able to stabilize anything above 1.2-1.3 volts. In this case, I included full load (Prime95 FTT Test) results and idle numbers too.

SandyBridge_OC_Analysis_CPU_Temperature_vs_Voltage_Idle.png

At idle mode my Core i7 seems to be colder than the Core i5 processor. Only when increasing voltage and CPU frequency, the Core i7 rises up its temperature to the point where it matches the Core i5 temperature. This is however a non-important case as they're both at idle mode. The real deal will appear in the next chart after I make them pass 30 minutes of Prime95 FTT test:

SandyBridge_OC_Analysis_CPU_Temperature_vs_Voltage_Prime95.png

At stock frequencies both CPUs are quite cold. They don't even reach 50 degrees, which is great for any PC. At this point the Core i7 is colder than the Core i5, which seems natural after watching the CPU power consumption charts. At 4GHz the temperature raised to 51 degrees for both processors. At 4.4GHz the Core i7 2600K raised its temperature to 59 degrees while the Core i5 2500K reached 57 degrees probably because it's got less thread and cache. Finally, at 4.8GHz the Core i5 reached 67 degrees and the i7 reached 74 degrees. Remember that limit between 70-80 degrees? That means we shouldn't put any extra voltage to the Core i7, while the Core i5 still has got a little gap to test. Anyway, it's always better to keep your CPU below 70 degrees.



 

Comments 

 
# RE: Intel Sandy Bridge Overclocking GuideJackNaylorPE 2011-04-21 12:37
Would have liked to see a comparison of setting the Turbo / Voltage to a fixed number versus using the Max turbo frequency / voltage offset method.
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# RE: RE: Intel Sandy Bridge Overclocking GuideServando Silva 2011-04-21 13:53
Hi Jack. Please check our forum as I've just explained why I didn't test that way. It would need another article just for that, or at least, a new set of tests.
Take care.
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# RE: Intel Sandy Bridge Overclocking GuideRobert17 2011-04-21 13:24
Nicely done. But you did make it seem like the "good old days" of mounting a PVC tank with a fish-tank pump feeding from an ice chest full of frigid water may be a thing of the past.

Not to get too far away from your core article regarding Sandy Bridge, but do you have any insight as to whether or not AMD will maintain OC potential in their new lineup?
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# RE: RE: Intel Sandy Bridge Overclocking GuideServando Silva 2011-04-21 13:57
Yeah. I've been overclocking for the last 10 years and I know many others who have been doing it for 15 years or so.
You know that phrase: "Like the old days". I'm not saying I don't like this new way of overclocking. Actually, I like not to pass several hours to find such a nasty or complex configuration for my PC, and doing it the the old way. New OC tools and features help a lot when what you just need is to bump your PC speed and get back to work, but sometimes it was funny to test and read a lot for that.
Also, sub-zero overclocking is quite fun, but with Sandy Bridge they somehow killed it.

Regarding the new AMD processors, I still have no information about them, so I'm anxious to test one.
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# RE: RE: RE: Intel Sandy Bridge Overclocking GuideDavid Ramsey 2011-04-21 14:30
The new way of overclocking-- raising the maximum multiplier use by Turbo Boost-- has one huge advantage over the old ways of increasing BCLK or the base multiplier: to wit, the processor can still downclock to low speeds when you don't need the performance. My 4.1gHz 980x always runs at 4.1gHz. A 4+gHz Sandy Bridge can idle at the same speed it does non-overclocked, saving a lot of power (and generating less heat).
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# RE: RE: RE: RE: Intel Sandy Bridge Overclocking GuideRobert17 2011-04-21 15:51
I'm not complaining. Maybe just pining a bit. I set up a simple OC on my MB, seldom vary it due to the stability, change to game, pretty much ignoring the power consumption. My bad. What limited understanding I have of UEFI seems to indicate that rebooting to change configs may become simpler.

And certainly the advantages of having a MB/CPU combo that is "self-monitoring" power, thrust, pitch and yaw outweigh the "good old days". And yes, I mostly like automatic transmissions over three-on-the-tree these days as well.
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# RE: RE: RE: RE: Intel Sandy Bridge Overclocking GuideServando Silva 2011-04-22 11:45
Completely true! As I've said. I'm not really complaining. I like the new way as it benefits final users. It's just they took away that "chilli spice" when overclocking. Also, they limited it to Unlocked processors and certain platforms.
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# RE: RE: RE: Intel Sandy Bridge Overclocking GuideOlle P 2011-04-22 10:30
"... sub-zero overclocking is quite fun, but with Sandy Bridge they somehow killed it."

You can say that again! I read somewhere that Sandy Bridge reach its peak performance at about 20C. If you cool it more than that it won't reach quite as high speeds.
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# RE: RE: RE: RE: Intel Sandy Bridge Overclocking GuideServando Silva 2011-04-22 11:48
Do you want me to say it louder? Yeah!
I've heard some processors do worst when going below 10-20C degrees. Again, it's good because now many users will be able to play and overclock without going extreme, but it won't be as interesting for extreme users.
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# RE: Intel Sandy Bridge Overclocking GuideJackNaylorPE 2011-04-24 15:35
One other thing I'd love to see addressed ... POITA ain't I :) ..... the 2600k I assume is running hotter cause of the HT..... Prior to reading the article, I cam to the same conclusion that 4.4 Ghz was the sweet spot for the 2600k for 24/7/365. Since this was a B'day build for Son No. 3, w/ Spring break and all I haven't been able to get near the thing in a week.....I used the Asus BIOS Profile feature to store OC Profiles from 4.0 to 4.8 GHz w/ these temps on the SIlver Arrow cooler:

Max Core Temps under (Idle - P95 load)

GHz..... 3.8 ... 4.00 ...... 4.2 ........ 4.4 ........ 4.6 ....... 4.80
Core 1 (51) (31 - 52) (29 - 54) (29 - 56) (31 - 62) (29 - 69)
Core 2 (53) (30 - 54) (30 - 56) (30 - 60) (31 - 66) (28 - 75)
Core 3 (53) (23 - 55) (22 - 57) (22 - 60) (31 - 68) (28 - 79)
Core 4 (51) (29 - 52) (28 - 55) (29 - 57) )31 - 65) (28 - 72)

Hope that formats well

What I am thinking now is making a "gaming profile" w/ HT turned off since I can prolly drop 7 - 10C at 4.8 Ghz ..... will give it a # when kid gets back in school but wondering if anyone's tried yet on SB.
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