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Advice for SLI Loop

post #1 of 13
Thread Starter 
Hey everyone!

I would like to get some feedback from the valued OC brainiacs. I plan on water cooling my AMD x6 and sli'd gtx480s. I do keep everything overclocked to about 15% over stock speeds. My question is the order to use in my loop, the best config for cooling and where to place a 2nd radiator and/or pump in the loop if I choose to do it. I was thinking:
Res - pump - rad - cpu - gpu - gpu - back to res. Is that normally what people to with SLI? Or is this config even feasable/appropriate: res - pump - rad - a 3 way splitter, 1 to cpu, 1 to gpu1, 1 to gpu2, then have all 3 reconnect to 1 tube back to the res? I personally don't think that would work but just a thought. Also if I were to add a second pump and radiator, where is the most efficient location for them in the loop?
Any feedback or advice would be greatly appreciated and will result in rep Thanks for reading!

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post #2 of 13
The order of the loop doesn't really matter. So you shouldn't worry about that.

The only thing you should be worried about is to complete the loop in such a way that the least amount of tubing is used.
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post #3 of 13
Yup, loop order won't matter by any noticeable amount, not to mention any heat dump from the CPU will be paltry compared to what the GPUs can handle.

Also, a splitter is a bad idea, especially between the CPU and GPUs. Usually you can get away with parallel GPU blocks because they offer similar restriction, but a 3 way split will kill flow to all three branches with only one pump (and the more restrictive branches, likely the CPU, will get even less).
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post #4 of 13
Thread Starter 
Thank you for responding guys. Will rep you when off my phone. Yeah my major concern that I didn't really mention would be heat dump from components up the line. Wondering what temp the water would be by the time it gets to the second gpu. This is why I am considering a second radiator, thinking this would result in the need for a second pump. When searching for this info I haven't found anything definitive with sli cooling.

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post #5 of 13
Thread Starter 
Anyone else have any advice regarding 2 pumps and 2 radiators? Is it worth it on a single loop? I've heard it helps greatly with temps. Or should it be reserved only for two loop systems? Thanks again and +rep for any thoughtful advice

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post #6 of 13
You could definitely use 2 rads and 2 pumps.. but its not needed imo
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post #7 of 13
Thread Starter 
Thanks for your reply Lune. Any recommendation on placement in loop? I am leaning towards doing a split with a Y connecter. 1 branch being powered by a pump to the cpu with the 2nd branch powered by a second pump going to my sli'd gtx480s and reconnecting before going back into the res. Anyone do this or is this overkill?

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post #8 of 13
I disagree about the loop order not mattering. I would never put my gpus in front of my cpu. That's a lot of unnecessary heat being pumped directly into your cpu. Another reason why the pump order does matter is for the obvious reason of having your pump pull from your reservoir. My advice would be to run two loops. Get one of those corsair sealed loop things (H50/ H70) for your cpu and use the loop you have now to only cool your gpus. Or skip the crappy Corsair loop and run two custom loops. And about the least amount of tubing being used, you have to remember that the more water you have in your loop(s) the longer its going to take to raise your water tempertaure. More water = better cooling. Just my .02
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post #9 of 13
Edit: And dont be like me using that feser1 cooling fluid. That stuff will clog up your loops in due time.

Edit Again: Sorry Didnt mean to double post
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post #10 of 13
Yeah loop order definitely matters... it can give you better temps, better than nothing

I run res > pump > radiator > CPU > rad > GPU > res

Also yeah... use destilled water
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