Cool N Quiet turns down your CPU voltage and core speed so that your fan can run slower and is therefore quieter when you're not doing CPU intensive tasks.
They even give you a small software applet that shows your FSB and VCore. I have a Venice 3200+, so my FSB is 2,000, and VCore is 1.78.
After enabling Quiet N Cool:
I noticed the FSB and VCore never changed when idle.1) Download and install the AMD Athlon™ 64 Processor Driver for Windows XP and Windows Server
2003 Version (exe) 1.2.2.2
2) Enable Cool'n'Quiet in your BIOS
3) Enable ACPI 2.0 support in your BIOS (if this option is available). Some motherboards have built-in
support for APCI 2.0 and offer no option to control it in their BIOS.
4) Set the power management to "Minimum power management" in Windows.
I sent a technical request to Asus about it, and their response was:
I responded with "No, that's the Q-Fan feature, and not AMD Quiet N Cool.Dear Sir,
The Cool N Quiet feature of the CPU is for controlling the CPU Fan speed according to the load of the CPU. This feature does not adjust the FSB or VCore of the CPU.
Who's right?