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be quiet! Dark Rock Pro 2 [review]

April 7, 2013 in Cooling, CPU, Intel, Overclocking, PC, Review



  • PSU: Antec Earthwatts 650W 
  • GPU: Galaxy GTX 465 underclocked with fan locked at minimum
  • MB: Gigabyte z77 UD5
  • CPU: Intel i5 3570K @4.4 base - turbo 4.6 3/4 cores active 4.8 1/2 cores active – speed step enabled

To give an idea about what is happening, as it pertains to the overclock, a ~2.5m video was made. This video demonstrates the effects of a dynamic overclock using turbo and dynamic voltage.

To qualify this (it does not cost performance in most cases) a rank of 31 globally 4x CPU is held by this CPU using this process.


Is the be quiet! Dark Rock Pro 2 quiet? With a maximum level of 28.8 db running OCCT Linpack and IBT the answer is:  Yes. The ambient noise level of the testing room was 20.9-21.9 db with the norm being 21.3 db, temperature was a stable ~61.16º F and the maximum noise level from boot to shutdown was 30.9 db (not caused by the Dark Rock Pro 2 but by the POST beeps) during boot up with idle levels varying up to a maximum of 26.1 db. For reference the results from the recent topflow testing may be used for comparison: http://tekinferno.com/archives/323/5

Sound levels, and their measure, are very subjective. What is agreed upon, is that 0 db is the human hearing threshold and that prolonged exposure to sound pressure levels over 85 db can cause some hearing loss. When considering the db range from 15 – 30 db (where a quiet fan should be) it becomes a matter of the HSF not being louder than other components in the PC. The Dark Rock Pro 2 does just that; adding nothing noticeable in the way of extra noise to a PC.


The testing methodology does not use a temperature delta, as this is subjective (like almost everything else in the world) and it (temperature delta) does not make the most accurate comparison when base ambient case temperatures are not the same. The minor changes in material resistance, the effects of coatings, the properties of the Thermal Interface Material, the fan speed changes when the CPU reaches a predefined temperature… Of these the fan speed at temperature is the biggest issue. The fan could be locked at 100% but that is really an unrealistic comparison as it is not an accurate representation of the true performance of the HSF under varied conditions that the end user will encounter.

What you get from the Dark Rock Pro 2 is a cooler that keeps temperatures under control as well as (or better) than the competition.

drp2 4.6-4.8

Packaging, contents and specifications
A closer look at design

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