Originally Posted by Komet
So I got my comp up to 2706 (stock cooling!! 49C Max load), 246x11, and I decided to see if Cool 'n' Quiet would still run because I don't need all that power 24/7. It's running just fine right now at 1230, 246x5. I heard some bad things about Cool 'n' Quiet + OCing, but I'm thinking it shouldn't matter because I reached my maximum OC using my max multiplier. What's the deal?
Unlike all the people before me, I think cool'n quiet is a great feature, at it may be good while overclocking. The advantage of c'n q is that is drops the freq and the voltage of the cpu only when you don't need full power (like watching a movie, mp3s, playing heroes3
). The response time when the load on the CPU increases if so small that you don't evan notice it had lower frequecy. It cam be measured in miliseconds, I don't think many of us can sense such a difference.
While OC-ing there is a voltage related issue. This applies only if the cpu is overvoltaged when OCed. As I said, the c'n q drops the frequency of the cpu, but it drops the Vcore also. The thing is it the drop in Vcore can be a little too abrupt to alow you to retain stability.
For ex: my A64 2800 runs OCed with c'n q enabled. At full speed it runs at a core voltage of 1.575V (when 9x multi is used) and it drops to 1.175V when idle (5x multi). I checked how it behaves with c'n q disabeled and I can retain stability with only 1.55V. The bottom line is that I have to overvolt it a little more to gain that stability when it balances between 5x and 9x multi, but the good thing is that during movie playback it doesn't heat up since it is idle at 5x and the fan stays at low RPM. This makes it worth since I hate hearing the fan blowing at 5000RPM while watching movies or listening to music.
BTW c'n q controls also the fan speed if it is a stock AMD fan, mine varies between 3000 (can't hear it) and 5000 depending on the temp of the CPU.
Since I'm the only one that seens to like this feature I advice you to check if your system is stable after enabling it. After all, it depends of the type of user you are if you find it useful or not.