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Loop config

post #1 of 3
Thread Starter 
Looking to build a custom res for my system and more than likely would need to rearrange my loop runs especially to eliminate one run that is currently at least 2 feet long. Currently my loop runs:

res -> pumps -> gpu -> 360 rad (top) -> cpu -> 240 rad (out back) -> res

Based on design and fitting locations on the custom res, runs won't be as clean in current config. I've seen mixed reviews on loop runs other than res to pump. I'm considering the following:

res -> pumps -> gpu -> cpu -> 240 rad (out back) -> 360 rad (top) -> res

I could switch the cpu/gpu positions but that causes me to switch rad positions as well because of tubing angles into the 240 rad out the back. flexible tubing will cause kinks in the line. Would the water be into the blocks that long to really make that much of a difference. With current config my temps are gpu/s 26c and cpu 35c. Both idle. Under stress really doesn't go up that much. I usually get up to mid/upper 30s for gpu/s and mid/upper 40s for cpu.

My current setup for reference. As you can see, there is a kink at the beginning of the run coming from the 240 rad back to the res caused by the flexibility of the tubing, weight of the tube/water and the angle coming back into the case. My projected IN port on my custom res will be somewhere near the power connection to the MB. Still won't eliminate the angle problem.
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Orange Slushie
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post #2 of 3
You can work it out. As a quick rule of thumb it takes ~260W of heat to raise water moving at 1GPM by 1°C.

This is a linear relationship, so double the heat load, double the temperature rise. Halve the flow, double the temperature rise and so on.

Your GPUs TDP is ~160W each, let's round that up to 200W to include overclocking, so we are looking at 400W total if they are both running flat out.

Let's assume 1GPM flow rate just for convenience.

dT = P / 260 = 400 / 260 = 1.54°C

So the water will be ~1.5°C warmer after going through your GPUs. Not a huge deal.

Of course if your flow rate is lower than 1GPM then that rise is going to be bigger, but even if it is as low as 0.5GPM (which you want to avoid anyway) then the temperature rise will only be ~3°C.
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post #3 of 3
Thread Starter 
Thanks for the answer. I reconfigured my loop res - pumps - gpus - cpu - 240 red - 360 rad - res. Where I thought my cpu temp would go up slightly, it actually seems to be a degree or two lower. But I created a different problem in removing the kinked areas. I added 3 x 90 degree fittings to remove the kinking problem from my outside the case rad. My flow has now gone from 3.7 - 4.0 to 3.1. I know I would get a little lose in flow but not that much with 3 90s. Back to the drawing board to formulate a new loop plan.

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Orange Slushie
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