Cool'N'Quiet or not Cool'N'Quiet? Thats is the Question...

[sawyen]

I was wondering whether or not to enable Cool'N'Quiet when running the system on a 500Mhz overclock? I read somewhere that Cool'N'Quiet may screw up some overclock? Any Comments?

Anyone had any experiences with overclocking with Cool'N'Quiet turned on?

Cheers

[Merlin4458]

doesnt cool n quiet lower the cpu speed if it doesnt need it? therefor will lower the clock. Could have got the wrong end of the stick though

[sawyen]

yea yea... i know it does.. but i was just wondering wether it would screw up anything by lowering the cpu multiplier?

[Jonny]

Cool'n'quiet is cpu fan speed - running it at a minimum speed. Its nothing to do with CPU speed.
Is it?
I personally disable it when overclocking, just to minimise heat.
Otherwise its on to reduce noise.

[StoneNewt]

Cool'n'quiet is cpu fan speed - running it at a minimum speed. Its nothing to do with CPU speed.
Is it?
I personally disable it when overclocking, just to minimise heat.
Otherwise its on to reduce noise.

Cool'n'Quiet throttles back the CPU multi & vcore when the CPU usage passes through a certain usage threshold, as the CPU runs cooler you can now throttles back the fan speed. This all adds up to a system running, at idle, quieter & cooler at the same time. Or at least that's how it works on my Abit AN8.

Just checked, idle temp is 26C with the fan at 1400rpm, after 1min of s@h CPU temp is 47C with a fan speed of 3300 rpm.

[oralpain]

Do not use cool and quiet if you are overclocking/underclocking, or overvolting/undervolting to any significant degree.

[sawyen]

umm... so its better to leave cool'n'quiet off? any other comments?

[SilentDeath]

umm... so its better to leave cool'n'quiet off? any other comments?

If you put multi at max and fsb higher than 200 I cant see there being any problem - but test it if your going to. You cant break anything by trying.

The problem is if you lower the multiplyer and inrease the fsb, it can et the multi at max which might not be stable..

Also it might alter voltage, but then only put it back to stock after, so you may only be able to have small overclock.




*I think*

[oralpain]

Every time I have enabled cool and quiet when overclocked to the point where I needed more than stock voltage, cool and quiet has locked up my computers, even at max multiplier. Even if I was using stock voltage ther would often be instability with cool and quiet.

You can trty what ever you like, it's not gonna blow anything up. Just test it and make sure your setup remains stable.

[StoneNewt]

C'n'Q only gives me a mild overclock of a shade under 2.5GHz (208x12 with a 3800+ S939, not a clue what core) perfectly stable but I'm not exactly trying here.

[sawyen]

Well... I found that that Cool'N'Quiet only works when the overclock is modestly close to the stock voltage. Tried it on a 2700 MHz 1.6V.. the system froze the moment it revert from 1350Mhz (5x270) back to 2700Mhz..

I also tried running them on stock multi and the best I could do was 11 x 225 @ 1.4V.. anything more the system would freeze when it returned to default speed.

My safest setup was running 9 x 277 as this was the only highest setup that did not freeze when I turned on Cool'N'Quiet..

Figured Cool'N'Quiet is more affected by Vcore rather than multis...

-- Update: Ohh! and Cool'N'Quiet keeps everything really cool.. CPU is only idling at 25C on 5x277... with my room temperature at 19C --

[rajindergill]

Has anyone had problems enganging cool and quiet. On my KN-e deluxe, its on in the bios but since I've got a mirrored Hard disk array, the processor still goes at 2200MHZ. Just don't get it? Also, when the machine has been on for sometime, windows does not fully shut down. Hardware or Operating System problem?

[directhex]

cool 'n' quiet requires a daemon installed in your os. it's not bios-controlled.

e.g.:

powernow-k8: Found 1 AMD Athlon 64 / Opteron processors (version 1.40.4)
powernow-k8: 0 : fid 0xe (2200 MHz), vid 0x2 (1500 mV)
powernow-k8: 1 : fid 0xc (2000 MHz), vid 0x6 (1400 mV)
powernow-k8: 2 : fid 0xa (1800 MHz), vid 0xa (1300 mV)
powernow-k8: 3 : fid 0x2 (1000 MHz), vid 0x12 (1100 mV)

[rajindergill]

The problem I had was that when I had one hard disk, the cool and quiet work when switched on in the bios. As soon as i went to a mirrored array, the cool and quiet stopped working. I've also updated the bios to the latest.

[sawyen]

ditto... you need to install a driver for your OS to dynamically adjust your CPU frequency. Your mobo drivers should already have it, or else just drop by AMD.COM and grab it from them.

When it's isntalled, you'll see a 'minimal power management' in your window's power management options. Enable that.. and u enabled C'n'Q..

Darn, AV8 bios rev 22 removed the C'n'Q when multis are altered past factory spec.. so much for my 9x277...

[plesuvius]

I wouldnt use this. You get HLT commands to lower heat/wattage use anyway for modern CPUs. You need a driver for the OS and os support/configuration (max savings power option + driver from amd.com).

I wonder if anyone has compared actual power usage with a system using just HLT and one using HLT + cool and quiet. I bet we're talking < 5w here.

IF you are a tweaker cool+quiet can/may cause stuff to break, and it can be a bit 'iffy' with overclocked systems. For heaven's sakes dont set max multi and clock in the bios, leave the bios on stock if you want to save power anyway!