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• Amd Cool'n Quiet Overclock

I discovered today that having AMD Cool n Quiet enabled in my BIOS appears to be slowing down my Windows XP SP2 system by about 29% on memory & CPU intensive workloads. I was wondering if (a) anyone else had encountered this, (b) anyone can offer an explanation, (c) there are any negatives I need to be aware of if I keep AMD CnQ disabled. With some superficial testing so far, I don't immediately notice any difference with CnQ off (other than the performance being what I expected from this new hardware). Drivers for amd radeon.

Free Download AMD_CoolnQuiet_Win.zip for your ASUS device drivers, install it on your computer to update the driver. Supports all AMD Turion™ 64 Mobile Technology, AMD Opteron™ Processors, AMD Sempron™ Processors, and Athlon™ Processors released through 2007. Sound blaster surround 5.1. Provides support for AMD PowerNow!™ technology and, where appropriate, AMD’s Cool-n-Quiet™ technology for Linux systems.

It seems to ramp up the CPU fan a little bit as my program maxes out 1 core, but that's the same as with CnQ on. And when I let the system idle the CPU fan slows down and the system's as quiet as a mouse (after years of 6 small fans churning like they want to go into orbit it's nice to again have a system where I can hear the HDDs seeking). Bonus question: Does CnQ cause issues with system stability? I ask because the reason I disabled it was because I have had a few freezes and 1 spontaneous reboot with my new hardware. After some fairly extensive testing I have concluded that CnQ definitely does significantly negatively impact the performance of my system.

Amd Cool'n Quiet Overclock

With CnQ enabled, I consistently get between 1.8/3 and 2.2/3 of the performance against when it is disabled. This is for CPU & Memory intensive code, either single or multi-threaded, although the impact is greatest when there is a single thread maxed out. The other point is that the performance I do get varies far more with CnQ enabled. With it disabled I get very consistent numbers. EDIT 2010-05-24: After a driver update from AMD CnQ no longer has a negative performance impact. But it still seems to cause system instability, although not as frequently as previously - every few days instead of consistently within 24 hours.