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bottom GPU running hotter than normal

post #1 of 12
Thread Starter 
Hey guys,

I have been running my loop in the same order for a couple of months now with no issues and great temps. Here is a pic of the current loop and GPU setup



Last weekend I change the GPU's to run in parallel to increase my flow rate. Now my loop goes through the radiators and then goes into the bottom GPU first, then up into the 6990 and further on to the CPU before returning to the res.

Since going parallel I have found that the first card in the loop (6970), which used to run unbelievably cool is peaking at around 58c. This is up well over 10c from its previous temp.

I am guessing what is happening is that the water is shooting up from the bottom and partially missing the bottom GPU block then being forced through the 6990 block and out. I think the 6970 is seeing a lot less flow through the card.

Can anyone think of a way to prevent/help this issue?
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post #2 of 12
Go back to series? iv always though of watercooling as a bit of trial and error, some times you do things that you think will improve temps but they make them worse.
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post #3 of 12
Go back to series. Parallel is only a good idea if you are using identical blocks and your in and out for each block are symmetrical so that the resistance for each path is exactly equal.
post #4 of 12
Thread Starter 
Quote:
Originally Posted by kevingreenbmx View Post
Go back to series. Parallel is only a good idea if you are using identical blocks and your in and out for each block are symmetrical so that the resistance for each path is exactly equal.
The funny this is that I have run them in parallel before but with the flow coming from the top and it was awesome! Increased flow and better temps.

The only difference now is that it is coming from the bottom upward.
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post #5 of 12
Something may be clogging up your bottom block.
post #6 of 12
Thread Starter 
Quote:
Originally Posted by kevingreenbmx View Post
Something may be clogging up your bottom block.
maybe its just a big bubble....

I will tip the case around tonight and see what I can do.
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post #7 of 12
Quote:
Originally Posted by kevingreenbmx View Post
Go back to series. Parallel is only a good idea if you are using identical blocks and your in and out for each block are symmetrical so that the resistance for each path is exactly equal.
This is really it, sometimes in certain situations the "better way" may not be better for you. I mean you can try and make sure the block isn't clogged and air bubbles aren't the problem. In the end it would probably be more work than just switching it back.
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post #8 of 12
if water is moving too quickly then little heat transfer takes place. That may be your problem.
    
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post #9 of 12
Quote:
Originally Posted by Ekemeister View Post
if water is moving too quickly then little heat transfer takes place. That may be your problem.
Actually if the water slows down it's worse, because then heat "sits" in the block. The more flow the better.
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post #10 of 12
Quote:
Originally Posted by Ekemeister View Post
if water is moving too quickly then little heat transfer takes place. That may be your problem.
this is not true.

Quote:
Originally Posted by wondergod View Post
Actually if the water slows down it's worse, because then heat "sits" in the block. The more flow the better.
this is bordering on truth, but for the wrong reasons. when the water moves slower, the boundary layer (section of water against the surface that does not move with the flow) gets thicker, which means that there is more material that relies only on conduction which hes a higher thermal resistivity than the combination of conduction and convection you get when the boundary layer is thin and more water is actually moving.

in practice though, flow rate has little impact on temperatures.
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