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Performance/longevity issues with mounting GPU AiO radiator on the bottom?

viivo

viivo

[H]ard|Gawd
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Sep 7, 2005
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I'm doing a little remodeling of the inside of my case which involves moving the PSU to the top and am wondering if putting the GPU radiator (EVGA hybrid AiO [usual rebranded Asetek]) in its place on the bottom could cause problems with the pump in the future. The manual that came with the hybrid cooler made a big deal about the radiator's exact placement and orientation for installation so I want to be certain before continuing.
 
if you move it a lot during the installation and placement it may create bubbles inside that may get stuck in the pump/block or make sounds however those will disappear in couple of days.. aside from that no other thing can harm the AIO, just be sure to take care with the airflow as putting in the bottom as intake will just pump all the heat inside your case, creating a warmer environment than habitual.
 
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This is a bad idea if there is even a little air in the AIO. If the air gets into the pump, it can break the vacuum with the fluid and your loop stops working.

You can test for this by taking out the AIO and shaking it. Can you hear water splashing a bit in there? If so, you have some air in the loop.
 
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Ocellaris said:
This is a bad idea if there is even a little air in the AIO. If the air gets into the pump, it can break the vacuum with the fluid and you loop stops working.
Click to expand...

Does that mean if there is air in the system, keeping the radiator above the pump is the best option?
 
viivo said:
Does that mean if there is air in the system, keeping the radiator above the pump is the best option?
Click to expand...

You want at least part of the rad above the pump. The air will collect in the highest spot in the loop. This is less of an issue with custom loops since the pump isn’t attached to the CPU or GPU. Custom loops just stick the rads wherever and the pump just needs to be low.
 
Agree with the others. Avoid if possible

I’ve also read that most AIC use Teflon to coat the inside if the tubes. So exercise caution when you bend the tubes. Too much bending at too strict an angle can cause the Teflon to loosen which then allows slow evaporation through the sealed tubes.

I don’t know how big a problem this is, I haven’t run into such a thing myself, but sill just something to be mindfully of. No > 90 degree bends.
 
Absolutely - I don't think it's practical. Most AIO combos will have some air in there. In fact - if you check Asetek's own mounting directions, they specify that the pump has to be at the lowest point.
During normal running the fluid in the system will be evaporating so that more air will be introduced. It's not a pressing issue normally but with the pump at the top, any evaporation becomes a bit issue.
 
Even if your sealed loop doesn't have any air in it right now, it will eventually. The tubing those things are made with tends to be ever so slightly porous and will admit air to enter the loop over prolonged periods.
 
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