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1st WC set-up Gpu-Cpu vs Cpu-Gpu

post #1 of 19
Thread Starter 
Hey,

I'm in the process of building my 1st WC set up.I seen i few set that start the gpu- cpu in there loop.Most set up start with cpu-gpu.Looking for some info about the performance temps in both loop configuration.

Thanks
jca73
    
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post #2 of 19
I asked this question previously and it really makes little difference. I opted for gpu > cpu loop. It makes no difference because the temperature of the water in the loop remains almost constant -

That is to say that water after ur gpu will not be significantly warmer than before it. The only important considerations in setting up your loop are reservoir placement before the pump and using the shortest, least restrictive route of tubing.

Hope that helps.

Im running a 5850 and q6600 both v heavily oc'd and couldnt be happier.
post #3 of 19
In general CPUs need to stay a little cooler than GPUs. My system for example, the max you want to see a i7 930 at is 80-85c. Any higher and its dangerous. With the GTX 470, it can go up into the 90s just fine (105 is supposedly the max).

So I would say CPU -> GPU if only because the CPU needs to be coolest. However with a large enough rad it shouldn't matter much.
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post #4 of 19
No. 4 in my sig...

It takes ~250W to heat water flowing at 1GPM by 1°C. As such the water is not going to be much warmer after going through either the CPU or GPU.

I would go for the order which gives the cleanest lines and the least tubing.
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post #5 of 19
I would do CPU>GPU. It helps keep my CPU temps down as my GPU temps will always be higher anyway. Doing the GPU first heats the water then sends already toasty water onto the CPU. It really doesn't matter a whole lot. Also, running the tubing for CPU>GPU (also could depend on where you mount the rad) makes it easier to run. Good thread for inspiration and examples
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post #6 of 19
If you can help it then try and keep CPU before GPU,as said before it doesnt really make too much of a difference in your loop order.
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post #7 of 19
Definitely cpu» gpu, youll see a difference on load and you dont want the gpu putting warm water on the cpu, the cpu needs to be cooled first for the best temp.
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post #8 of 19
Hi,

Agree CPU then GPU as even though stays constant in loop.
In fact I'd put a rad between the chips based on just that senario.
JMHO.

It would make sence on GPU adding more heat before going directly to CPU
May not be much but every(c) helps.

Later
Edited by Irocing - 7/24/11 at 5:13pm
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post #9 of 19
Thread Starter 
Thanks for the replies guys.

In the case of some of I7 user i see why you would go cpu 1st,but in my case my x3 740 taps out 55c on load on a bad heat wave days and 5770 78-82 c on Witcher 2.I just trying to compare configuration ,if i go gpu loop 1st it just seem to be more shorter tubing streamline set up.
    
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post #10 of 19
Thread Starter 
Quote:
Originally Posted by nelson View Post
I asked this question previously and it really makes little difference. I opted for gpu > cpu loop. It makes no difference because the temperature of the water in the loop remains almost constant -

That is to say that water after ur gpu will not be significantly warmer than before it. The only important considerations in setting up your loop are reservoir placement before the pump and using the shortest, least restrictive route of tubing.

Hope that helps.

Im running a 5850 and q6600 both v heavily oc'd and couldnt be happier.
What where your temp on air vs water cpu and gpu?
thanks
    
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