|Antec Kühler H2O 620 Liquid Cooling System|
|Reviews - Featured Reviews: Cooling|
|Written by David Ramsey|
|Thursday, 10 February 2011|
Page 5 of 6
Testing and Results
For this test, I used the following heat sinks in addition to the Thermaltake Jing:
For heat sinks without a stock fan, I used a Thermalright TR-FDB-12-1600 fan, which puts out 63.7CFM at 28dBa according to Thermalright. This mid-range fan provides good air flow and reasonable noise levels. For "apples to apples" testing, where each heat sink is tested with the same fan, I used a Delta AFC1212D. This high-performance PWM fan is rated at 113CFM at a claimed 46.5dBa at full speed...which means that while it moves quite a bit of air, it's very loud.
The Intel Core i7-950 I used in this test runs much hotter than the Core i7-920 I'd used previously. At 1.35 volts, with a BCLK of 175Mhz, the 4,025Mhz CPU pumped out enough heat to stress the very best heat sinks. AIDA64 would report throttling once any single core reached 100 degrees Celsius; any throttling resulted in cancelling the test and recording a "FAIL". Although this overclocked and overvolted Core i7-950 represents an extreme, these are expensive, high-end heat sinks.
The chart below summarizes the results with the stock fans (hotter temperatures towards the top of the chart, and cooler temperatures towards the bottom). The twin-fan Cooler Master V6 GT and Corsair H70 have a real advantage here, since their dual fans move more air than the stock single fan of any of the other units. The Corsair H70's fans at their default 2,000RPM level move a lot of air together, but also generate a fair amount of noise. At the 1,600RPM level achieved with the in-line resistor cables, the noise level is much reduced, with a relatively minor performance hit.
Stock Fan Tests
With its dual, high performance fans (according to Cooler Master, each fan is rated at 93CFM at full speed, for an aggregate airflow of over 180CFM) the Cooler Master V6 GT takes the lead here, keeping the blistering hot Core i7-950 4.7 degrees Celsius cooler than the Kühler. What's amazing here, though, is that the thin-radiator, single-fan Antec Kühler performs within a fraction of a degree of the double-thickness radiator, dual-fanned Corsair H70.
There's a 5.3-degree "break" between the Coolit Vantage A.L.C. and the Corsair H70, which neatly separates the coolers into "lower performance" and "higher performance" groups.
Delta High Speed Fan Tests
With the Delta high-speed fan, our lineup changes. Showing what a difference a change of fan can make, the Coolit ECO A.L.C. moves from the bottom to the chart to mid-pack, improving by almost 11 degrees. The Antec Kühler improves by 7.2 degrees, putting it— amazingly— between the mighty Prolimatech Super Mega and the Thermalright Venomous X. Note how far ahead of any of the other water coolers in the test this is. I think the Corsair H70's thick radiator puts it at a disadvantage with only one fan, no matter how powerful; a dual-fan solution is probably best for this cooler.
In this chart, there's a 4.8-degree "break" between the Coolit ECO A.L.C. and the Cooler Master V6 GT. In this "apples to apples" comparison, the three top-performing air coolers are obviously in a class of their own...along with the Antec Kühler. I have never seen a pre-configured water cooler turn in this kind of performance.