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Great gpu temps, mediocre cpu temps?

post #1 of 51
Thread Starter 
Hey guys, I'm posting here because while I love my water cooling, my cpu temps are pretty crappy.

Here is a breakdown for you guys:
My gtx 580 runs at 940mhz @ 1.15v, maxes out at 55c with pretty high ambients.
My 2600k runs at 4.6ghz @ 1.32v, maxes out at ~75c.

I'm thinking the culprit of the bad temps is either the fact that the pump is not powerful enough, or the cpu block is too restrictive. I think it is a little of both, but I think one could be solved by fixing the other.

So, my question is, do I:

A) Get a better cpu block to relieve the pump a little bit.

B) Get a better pump to push the flow through the cpu block better.

C) Do nothing and live with my 4.6ghz limit on water.

I would much rather do option A because it would be the cheapest option as far as changing hardware goes, but I would love to hear what you guys think.

Thanks!

EDIT: I just realized it would probably be helpful if you guys knew what kind of hardware I had.

Here's my setup currently:
xspc rasa cpu block
EK full cover gtx 580 block
xspc rs360
xspc rs240
xspc x20 750 pump
Edited by Behemoth777 - 6/15/11 at 2:07am
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post #2 of 51
Is that your CPU temp during a stress test at full load? I'm not sure what your ambient temperatures are, but those actually sound about right for your VCC. Mine were pretty high (high 80s), but that's because I have an H70.
post #3 of 51
Thread Starter 
Quote:
Originally Posted by E-Peen View Post
Is that your CPU temp during a stress test at full load? I'm not sure what your ambient temperatures are, but those actually sound about right for your VCC. Mine were pretty high (high 80s), but that's because I have an H70.
Yeah, that's during full load. But heck, I'm using a 360 + 240 rad for my cpu + gpu. That seems a bit high to me for all the rad space I have. Especially because my gpu is loading in the 50-60c range even with the higher ambients.
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post #4 of 51
Idk if this is possible but open the cpu block and check how restrictive it is, and if you
want use a dremel on the insides to increase the space in the block for more waterflow.
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post #5 of 51
Did you clean the block prior to installation?

There might be gunk left over from the manufactuting process
post #6 of 51
The rasa is not a very restrictive block.

What fans are you using on your rad?

What TIM are you using?

What gpu block are you using?

Also, how does your loop go? like 360> cpu>gpu>240>pump?
Edited by nametagg - 6/15/11 at 6:44am
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post #7 of 51
Quote:
Originally Posted by nametagg View Post
The rasa is not a very restrictive block.

What fans are you using on your rad?

What TIM are you using?

What gpu block are you using?

Also, how does your loop go? like 360> cpu>gpu>240>pump?
If I remember correctly the Rasa block was one of the least restrictive (less then Heatkiller and dangerden).

I dropped my Rasa pump after 1 week would not push water through my loop. My vote is for a new pump.
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post #8 of 51
Quote:
Originally Posted by Behemoth777 View Post
Yeah, that's during full load. But heck, I'm using a 360 + 240 rad for my cpu + gpu. That seems a bit high to me for all the rad space I have. Especially because my gpu is loading in the 50-60c range even with the higher ambients.
Radiator efficiency depends in no small part on the difference between the coolant temperature and the ambient air temperature. The higher the difference, the more efficiently the rad will exchange heat. Consequently, the more rad you have, the less the temperature differences become and the less efficiently they perform. It's a classic case of diminishing returns.

That's not even to mention that adding more rad adds more restriction to the loop which slows the coolant flow through the system and also affects heat because it's preferable to have coolant get in and out of the rad and heat removed from the loop as quickly as possible.

I agree with E-Peen in that your temps seem par for the course, but personally I would try taking the 240 out of your loop because the 360 should be enough to dissipate all that wattage running at peak efficiency.
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post #9 of 51
Thread Starter 
Quote:
Originally Posted by kiwiasian View Post
Did you clean the block prior to installation?

There might be gunk left over from the manufactuting process
Yup, everything is clean.

Quote:
Originally Posted by nametagg View Post
The rasa is not a very restrictive block.

What fans are you using on your rad?

What TIM are you using?

What gpu block are you using?

Also, how does your loop go? like 360> cpu>gpu>240>pump?
I'm using high speed yates on my radiator.

I'm using mx-2 tim.

I'm using the EK full cover cpu block.

My loop goes pump/res>gpu>360>cpu>240>pump/res

Quote:
Originally Posted by Isopropyl View Post
If I remember correctly the Rasa block was one of the least restrictive (less then Heatkiller and dangerden).

I dropped my Rasa pump after 1 week would not push water through my loop. My vote is for a new pump.
I was afraid of that, thanks for the input though.

Quote:
Originally Posted by Petrol View Post
Radiator efficiency depends in no small part on the difference between the coolant temperature and the ambient air temperature. The higher the difference, the more efficiently the rad will exchange heat. Consequently, the more rad you have, the less the temperature differences become and the less efficiently they perform. It's a classic case of diminishing returns.

That's not even to mention that adding more rad adds more restriction to the loop which slows the coolant flow through the system and also affects heat because it's preferable to have coolant get in and out of the rad and heat removed from the loop as quickly as possible.

I agree with E-Peen in that your temps seem par for the course, but personally I would try taking the 240 out of your loop because the 360 should be enough to dissipate all that wattage running at peak efficiency.
Hmm, I never thought about just running my loop off only the 360. It's an rs360 though, do you think it would handle even a heavily overclocked 2600k and gtx 580 with high speed yate loon fans?
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post #10 of 51
You should be more than fine, and I think your GPU temps reflect that... I think you should try reseating your CPU once (or more). Your CPU and GPU temps should be within 10c or so of each other, though I suppose if you're utilizing them at the same time 100% (like CPU+GPU folding) 20c difference isn't that big. It sounds like your loop just has a lot of heat on it, and those temps could sound right under the right circumstances.

Gaming I never see CPU temps being more than 20c higher than GPU temps, only during folding, where the air-water DeltaT is at it's max, about 10-12c.

EDIT: I guess it helps if I post specs too so you can see where I'm coming from.
2600K @ 4.3ghz stock voltage, 2x6950s @ stock clocks and voltage, all on one GTX360 with Panaflo 2100RPM fans (at the loads we're talking about)
Edited by Dr.GumbyM.D. - 6/15/11 at 10:30am
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