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Bigger rads?

post #1 of 9
Thread Starter 
Will a bigger rads give you lower idle temps or lower load temps? or will there even be a change? Also whats the best pump for three gpus on one loop(6970's) and an i7-2600k on another loop?
Edited by Mikehunt47 - 6/1/11 at 10:35pm
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post #2 of 9
Yes, bigger rads will dissipate more heat. For multiple blocks in one loop mcp655 is the best pump.
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post #3 of 9
I would have thought, in theory, it would lower both as there would be more surface area able to be cooled.

I cant answer the other part of your question, Ill leave that to others with more experience.
post #4 of 9
Thread Starter 
exactly what i was thinking i was just making sure thanks guys and would i need 2 seperate pumps for 2 seperate loops?
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post #5 of 9
A bigger radiator will help with loaded temps because it gives more heat transfer surface area, so the water temperature runs closer to ambient temperature.
Unless you had really bad cooling to begin with, it is unlikely it will do anything for idle temps.
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post #6 of 9
I'm running 3x GTX570's and a I7 950 @ 4.2Ghz on 1 loop with a MCP655 pump and 2 swiftech 360 rads. GPU temps ~45c loaded and CPU ~62c with everything at full load.

I ran 2 loops thinking it would lower temps but it didn't make enough of a difference to even bother (Waste of money IMO).
post #7 of 9
Unless you are stressing the CPU and GPUs at the same time, a single loop will give better temperatures, provided you actually have adequate radiators/pumps for the heat load,
If the CPU and GPU's will all be under full load at the same time, like while folding, you can get a minor improvement in CPU temps with a dual loop setup.
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post #8 of 9
Thread Starter 
if i do a single loop what configuration would u recommend?
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post #9 of 9
It's entirely up to whatever specs you can afford/fit in your computer case....

I've got two 6950s in crossfire. They're overclocked to over 6970 speeds and shader unlocked, so for the purpose of discussion, they put out as much heat as at least 6970s. I've also got a 2600k overclocked at 4.3ghz.

I use 2 XSPC Razor 6970 blocks which keep my cards at under 50c at load (in everything but furmark, but furmark is a bad measure for temperature anyway since it's entirely unrealistic), and a Swiftech GTX for CPU. My radiator is a HW Labs GTX360, and my pump is an MCP355 with XSPC res/top. I've got 3x2200rpm Yate-Loon fans on a PWM controlled controller.

With that hardware, I'm at about a 5c air-water delta, which is very good. It would likely provide extra overhead for 2 more GPUs before I would have to consider adding a second radiator. I rarely have to crank up my fans, and based on my own fan profile, they never go over 70% speed. I went watercooling because of the noise of the GPU fans, and because it's fun to tinker with. Lower temps have been great, and I've had a great experience thus far as my loop has been easy to set up and run.

Check out my build log in my sig for more info on my setup, and feel free to ask any questions since I've got a similar setup to what you're setting up, except you'll have one more 6970.
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