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GPU loop- terrible 6990 temps

post #1 of 29
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Looking for some help here as this is my first attempt at a custom loop. Here is my setup being used for my trifire combo (only using the 6990 at the moment to troubleshoot):

Pump/Res/Rad- Swiftech MCR-X20 Drive
7/16 tubing
XSPC 6990 block


I have a very simple loop going from the 35x pump at the top front of my case down to the 6990 and 6970 and back up to the rad. My temps on the 6990 idle around 60C and under load they will reach over 90+! Initially I thought perhaps there was too much restriction with the 6970 in the loop so I removed it, but it made no difference.

I've reseated the block and reapplied NT-H1 tim and it made no difference. I can hear the pump working fine and I can't find anything that would be restricting flow...it's a really simple loop.

Anything I am overlooking or can check/test?
    
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post #2 of 29
When you removed the block, did it look like it made good contact w/ the GPU dies?
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post #3 of 29
How quickly do your load temperatures reach 90C, is it within a minute or so, or over several minutes?

Can you tell us the temperature of your water at idle and load?
post #4 of 29
Thread Starter 
It looked like it did from my perspective, the tim was spread out quite well. Here's a dumb question, if I were to loosen a fitting on the block while the pump was running, would water "spray" all over the place or would it just be a very small trickle? When I removed the card from the case with the pump running I was able to unscrew one the caps almost completely off and water just barely trickled out.
    
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post #5 of 29
Quote:
Originally Posted by earthwormjim View Post
How quickly do your load temperatures reach 90C, is it within a minute or so, or over several minutes?

Can you tell us the temperature of your water at idle and load?
Reread the OP. the states it quite clearly. 60*C idle and +90*C load.

When things like this arise, it's usually the pump that isn't performing well enough, or simply cannot handle pushing that amount of water.
     
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post #6 of 29
Thread Starter 
Quote:
Originally Posted by earthwormjim View Post
How quickly do your load temperatures reach 90C, is it within a minute or so, or over several minutes?

Can you tell us the temperature of your water at idle and load?
Within about a minute of opening anything gpu intensive the temps skyrocket.

I don't have anything to measure the water temp unless you mean the GPU? I can tell you the inlet side is cool and the outlet side of the tube gets very hot.
    
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post #7 of 29
Quote:
Originally Posted by KidKB View Post
Within about a minute of opening anything gpu intensive the temps skyrocket.

I don't have anything to measure the water temp unless you mean the GPU? I can tell you the inlet side is cool and the outlet side of the tube gets very hot.
Your pump isn't strong enough for that setup. Get the 655 model pump and you'll be fine. It may be a simple loop but it requires a powerful cooler to keep three GPUs cool.
     
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post #8 of 29
Quote:
Originally Posted by KidKB View Post
It looked like it did from my perspective, the tim was spread out quite well. Here's a dumb question, if I were to loosen a fitting on the block while the pump was running, would water "spray" all over the place or would it just be a very small trickle? When I removed the card from the case with the pump running I was able to unscrew one the caps almost completely off and water just barely trickled out.
The pump should be supplying ample pressure to make it squirt out but it all depends on how far you opened the cap.

Do you have a flow meter in your loop? I'm thinking you might have too much restriction somewhere or a weak pump.
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post #9 of 29
Quote:
Originally Posted by Imglidinhere View Post
Reread the OP. the states it quite clearly. 60*C idle and +90*C load.

When things like this arise, it's usually the pump that isn't performing well enough, or simply cannot handle pushing that amount of water.
Wow, maybe you should reread what I asked...

Quote:
Originally Posted by Imglidinhere View Post
Your pump isn't strong enough for that setup. Get the 655 model pump and you'll be fine. It may be a simple loop but it requires a powerful cooler to keep three GPUs cool.

His pump should be fine, it's an MCP35X. It provides more head pressure than a D5.


Quote:
Originally Posted by KidKB View Post
Within about a minute of opening anything gpu intensive the temps skyrocket.

I don't have anything to measure the water temp unless you mean the GPU? I can tell you the inlet side is cool and the outlet side of the tube gets very hot.



KidKB are you controlling the speed of your 35x? Is it running at full speed? Is it plugged into a motherboard fan head?

The change in water temperature coming out of a water block should at most be a few degrees Celsius. So your flow-rates are probably very low.
Edited by earthwormjim - 10/3/11 at 11:21am
post #10 of 29
Thread Starter 
Quote:
Originally Posted by earthwormjim View Post
Wow, maybe you should reread what I asked...




His pump should be fine, it's an MCP35X. It provides more head pressure than a D5.







KidKB are you controlling the speed of your 35x? Is it running at full speed? Is it plugged into a motherboard fan head?

The change in water temperature coming out of a water block should at most be a few degrees Celsius. So your flow-rates are probably very low.
Earthwormjim- I currently don't have the 4-pin pwm plugged in as my H100 is using it for the cpu block. From what I've read it means the 35x would be running at 100% all the time though?

I thought the 35x would be enough for such a simple loop, but perhaps the length of the tubing is killing flow? I would say it's a good 2ft in length from the pump to the video card(s).
    
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