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Newbie question: CPU temp vs. loop temp?

post #1 of 8
Thread Starter 
Finally got the system up and running then way I wanted it. At stock CPU clocks, it works perfectly. And keeps the two 5970s below 40C even when overclocked and running Milkyway@Home on all 4 GPUs.

However, as soon as I crank up the CPU clock, CPU temps rise rapidly (75C+) even though the temperature in the loop (before the radiators) is still below 30C, and it seems as if the limiting factor is now getting the energy away from the CPU and into the waterblock.

Does that make sense, and is that "normal"?

Can somebody please post their CPU and pre-rad water temps, please? Just so I have an idea of what to expect?

Thx!
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post #2 of 8
Yeah, thats perfectly normal. Even with a great cpu block, its just not possible to dissipate all that heat from the cpu quickly enough to stay close to loop temp. Gpu blocks enjoy an advantage because they are so much larger, and therefore gpus stay much cooler even with similar tdp values to a cpu.
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post #3 of 8
My 930 on air I could run at 3.2 with stock parts.
My 930 only loop ran high 60's at 4.2 with water cooling
My 930 + 5970 runs high 60's and pushes into the 70's after a few hrs of gaming

You probably have a seating issue with your TIM and block. Either you have to much TIM not enough TIM or not enough pressure on the cpu block.

Also what is your O.C. specs voltages and what not?
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post #4 of 8
Thread Starter 
Quote:
Originally Posted by Arksniper View Post
You probably have a seating issue with your TIM and block. Either you have to much TIM not enough TIM or not enough pressure on the cpu block.
That's what I was wondering. Looking into that some more. Thx!
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post #5 of 8
Depends on flow rate and sitting, you might have high temps.
But the 980 is pretty cool. Myself even at 1.55v I don't reach 70c.

Re-sit the block, reapply the TIM and make sure the flow is fine and there are no kinks/issues that might bother the flow rate.
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post #6 of 8
that does seem a touch high, mine doesn't go above 35 on full load, for ageess, I know mine is of no where near the same 'beef' but, still... try remounting the cpu block, screwing in with opposite corners, one turn at a time and all that standard jazz
    
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post #7 of 8
I have heard that some people reversing the direction of flow in there loop can help, but only like 2-3 degrees.
 
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post #8 of 8
Quote:
Originally Posted by Jump3r View Post
I have heard that some people reversing the direction of flow in there loop can help, but only like 2-3 degrees.
...? You mean changing the order of the loop? I'm not sure how going from pump to reservoir would help. Even if he did switch the order it would probably only help about a degree if it even does help. I think it might be a mounting issue. How'd you apply your TIM? How much? How tightly did you screw it down?
    
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