Why disable Cool & Quiet when overclocking?

[DigitalFreak]

Just curious as to why you should disable Cool & Quiet when overclocking? I know that C&Q adjusts the multiplier, etc. to slow the CPU down when it's not under load, but isn't that a good thing as far as temps go? Wouldn't it still crank back up to the overclocked speed when the processing power is needed?

 

[BlueWeasel]

It depends what software/drivers you are using for the CnQ control. The default AMD CnQ driver only works with the default multiplier for the processor. If you are trying to use a lower multiplier than the default coupled with a higher HTT/FSB, then crashes are likely going to occur when the AMD software tries to bump up to the higher multiplier

However, RMclock and CrystalCPUID's handling of multipliers/voltages doesn't have this restriction, and seem to work well if you are overclocking with a lower multiplier.

Also, CnQ doesn't seem to work very well on some NF3 754 boards with 2 DIMMS being used. My Epox board locks up immediately when trying to use CnQ when 2x512 RAM is installed....with only one stick, it works fine.

 

[F1shF4t]

Also on some mainboards when u enable cool and quite u cant adjust votage for the cpu, on my A8v deluxe thats the case, and also when u use some memory dividers cool and quite cause the ram to change frequency with the cpu.

I havent even tryed to turn it on on my dfi board as i'm using dual cores and heard there could be problems with using cool and quite for a dualy.

 

[stevty2889]

For higher overclocks, you tend to need to increase the voltage to keep it stable. Cool and quiet will lower the mulitplier and the voltage. Since you are overclocked, you will still be overclocked with the lower multiplier and the voltage lowers as well..but the voltage might drop enough, that it's not enough to keep it stable with the lower speed. For example, I need 1.475v to keep my cpu stable at 2.618ghz, and still needed that voltage for 2.5ghz. Cool and quiet kicks in and lowers my multiplier from 11x to say 10x. At 20x, my CPU is still at 2.38ghz..but the voltage dropped as well, and may not be high enough to keep the cpu stable at 2.38ghz because it's still higher than stock speeds.

 

[openwheelformula1]

I have a 25% overclock, and I use CnQ. 24hrs prime stable.

 

[furballi]

No problem here with C n Q. Running ECS NF3 754 with 2 x 512 Corsair VS.