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[i5 2500k] Tiny problem, downclocking?

post #1 of 5
Thread Starter 
Ok, so this has been annoying me for a bit now.
I have my sandy running at 5Ghz but when i load up prime95, or any other stressing software like intelburn, it works fine for the first minute or so after wich it starts throtteling down to 3,3ghz and then back up to 5Ghz pretty much non-stop.
For example i get 65 gigaflops the first run of intelburn and 54 the second run....
I dont think that it is hitting a thermal wall as temperatures never exceeded 85c.(yes i know that that is hot but trust me ill never get those temps in games).

So, what could be causing this? my PSU not being able to cope?
You tell me....

With regards,

-XeloX
Edited by XeloX - 4/28/11 at 11:41pm
    
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post #2 of 5
It's definitely a heat problem. It may be your MOSFETs, but Asus motherboards are known for their overclockability and stability, and I'm quite sure that the MOSFETs on your board are cooled by heatsinks. But try blowing a fan around your CPU area, and see if that keeps happening. If it does, it's definitely a cooling issue.
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post #3 of 5
Thread Starter 
Quote:
Originally Posted by Ipwnnubletz View Post
It's definitely a heat problem. It may be your MOSFETs, but Asus motherboards are known for their overclockability and stability, and I'm quite sure that the MOSFETs on your board are cooled by heatsinks. But try blowing a fan around your CPU area, and see if that keeps happening. If it does, it's definitely a cooling issue.
So, will this give me any problems in games or applications? i have not noticed any thermal throtteling (if that is indeed what this is) yet while gaming.

edit: there are already 2 fans aimed at the cpu area but ill add another intake fan at the front.
    
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post #4 of 5
Thread Starter 
Well, it seems like the temperature is not causing it....
It hits 71c max on the 3rd core in prime95 and it is still trotteling down, and up, and down, and up...
Driving me mad!

I am at 4.7ghz atm btw. (summer weather f you )
    
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post #5 of 5
Thread Starter 
UPDATE :
After replacing the pre b3 motherboard for the standard p8p67 (not LE) i have had 0 issues with clocking down.
I think it is safe to say that either the motherboard itself or the BIOS was messed up.
I am also getting spot-on voltage readings for the 12v, 5v and 3.3v rails in the BIOS.

case closed

-XeloX
    
CPUMotherboardGraphicsGraphics
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