Is it possible to adjust CPU freq/voltage depending on CPU load?

Associate
Joined
15 Mar 2006
Posts
2,097
I've got my Opteron running at 240 x 9 at the moment, which goes up to approx 290 x 9 at 1.45V. CPU temp under load then goes up to around 50 at 290MHz, not sure what it is at idle, but it's higher than idle temps at 240MHz of course.

I want to have the higher frequency (therefore higher volts) when i'm doing stuff that might actually need it, but not to have the higher volts running through the CPU because i want it to last as long as possible.

Is there any software which can do what i want? Or is that something only a non-existant BIOS mod could do?
 
Soldato
Joined
5 Mar 2006
Posts
3,975
Location
Nottingham
Got an Asus motherboard with AI N.O.S?

Set the overclock to 10% and it'll increase up to that to meet demand and go back to stock when idle/not under full load.

Not as great as a manual overclock, but it's something :)
 
Last edited:
Associate
Joined
3 May 2006
Posts
398
That's what Cool & Quiet does. I've combined C'n'Q with oveclocking. I've overclocked my 4200+ by 10% to 2.4GHz (using the 10% overclock profile available in the BIOS) but I also have C'n'Q turned on. This means that when the system is at idle the CPU is at 1GHz with low volts and low temperature but when a program needs more power then the CPU automatically goes up to 2.4GHz.
I'm using the auto 10% overclocking profile but you can manually overclock to any values that you need.
 
Suspended
Joined
17 Mar 2006
Posts
9,055
Apparently overclocking and cool and quiet are not safe to use, because of voltage changes or something. Either use cool and quiet at stock, or disable cool and quiet but overclock.
 
Associate
Joined
3 May 2006
Posts
398
C'n'Q changes voltages regardless of whether the cpu is overclocked or not. I think that at the 10% overclock profile the voltage is kept the same as at stock but i'm not sure.
 
Associate
Joined
27 Nov 2002
Posts
731
Location
Warwickshire
Google for RMclock. A great CnQ like utility where you can define custom voltages/mutipliers that adjust depending on load. From the same people that do the Rightmark benchmarking apps.
 
Associate
Joined
5 Jul 2005
Posts
1,734
Location
Edinburgh
50 load at 1.45v is fairly high. What are your idle temps. You may be better just getting a good heatsink and leaving it at 2.9ghz. Cool & quiet is best left off when o/c - can cause crashes due to the extra volts
 
Associate
OP
Joined
15 Mar 2006
Posts
2,097
I'd considered cool n quiet but i'd heard it's not recommended for use with overclocking, so i avoided it. My worry with it is that the voltage goes down along with the multiplier, but the lower voltage cant sustain the unaltered FSB/HTT.

RMClock looks like what i want, it seems to be unstable, but i'll try it out on Sun/Mon.

Those temps were for my old an8-sli mobo, with an arctic freezer pro 64. idle temps at 200MHz were at 20-23, so if 1.45V, 290MHz under load at 50 degrees is high, it must be something to do with my CPU.
 
Soldato
Joined
13 Jan 2003
Posts
23,790
The recommendation not to use CnQ when overclocking was due to yhe sudden rise and fall of current demand on the motherboard PSU.
 
Back
Top Bottom