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X58-UD3R under vacuum?

post #1 of 8
Thread Starter 
I want to know if I can pull a full vacuum (about 1 millibar anyway) on my motherboard / cpu + cooler / video card / power supply without something popping. Odd question I know, but I will be making a submersed build in a dielectric fluid, and I want to evacuate all the air so I don't get air insulation bubbles in little places.

The plan is a gradual pressure drop from 1 bar to 1 millibar over about 25 min, so there won't be any explosive depressurisation.

Any ideas?
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post #2 of 8
That's quite the question!

Free bump, for science!
    
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post #3 of 8
its not like the board uses air to function....

it only needs some kind of fluid to cool the heat sinks and that is all.

I would have thought this was kinda obvious but I guess its not bad to be sure.
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post #4 of 8
Thread Starter 
Don't know how capacitors handle vacuum. I imagine there are large electrolytic caps in the psu that might complain. For all I know, under the cpu cover there might be air that will have to escape.

The more I think about it, the more I think it may be a problem. Electrolytic caps might boil the electrolyte in them.
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post #5 of 8
My assumption is you would evacuate the air and then submerse the components without power. Once the components are submersed you could expose to the atmosphere and there shouldn't be any negative pressure to worry about.

A concern would be what thermal characteristics does the dielectric fluid have and at what voltage does it break down at a given gap. Does it have good thermal conductivity? The 120V in the power supply will have a minimum of 3mm gap between line and safety and I think 1.5mm between line and neutral.

Also you have to have wires coming out to components that cannot be submersed. If you maintain a negative pressure you might have air migrating in from inside the wire insulation themselves.
post #6 of 8
Thread Starter 
That's the plan. Come to think of it, since the dielectric fluid I'm going to be using is really good (around 70,000V breakdown at 2.5mm spacing), it shouldn't make any difference if it displaces some of the air inside a capacitor.

The vacuum would only be temporary after all. I will be sitting the entire "case" minus hdd and opti drive inside a room and then gradually evacuating the air out, then introducing the oil. Once the oil is in, release the vacuum (gradually again) and it should have filled every possible pocket in the m/b, psu, gpu's (2 x gtx570's if I can get sli to work reliably), fans, everything. Which means, I think, that there won't be any point cooling problems experienced in other oil immersed pc's.

Or it will pop the capacitors and I will have a rather expensive failure. But that's all part of the thrill isn't it Maybe I'll put an old psu and mboard under full vacuum first and see what happens... Less fun, but meh.
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post #7 of 8
What kit do you have that can pull a 1mbar vacuum on a whole room? That's some serious equipment you're playing with.

I wouldn't pull full vacuum on caps as I think you're asking for trouble, and could fry things as a result. You also may have issues with heatsinks etc, as pulling a full vacuum could pull the thermal paste out. You may even have problems with heat pipes bursting (although that really is unlikely.

TBH though, I'm not sure it's going to be worth it. Adding the oil (warm if possible, to keep the viscosity as low as possible) & agitating the system would be a better way of getting rid of the air with far fewer risks to the kit.
post #8 of 8
Thread Starter 
The "room" is actually a vacuum oven used for drying small to medium sized oil-submersed transformer windings. Takes about 22 minutes to get from atmospheric to 1mbar, in a 10ft x 10ft x 7ft tank. Set up for filling distribution transformers with hot oil under full vacuum without exerting pressure on their oil containment tanks. Good vacuum pump. It's capable of 0.4mbar, but getting a perfect seal on a 10ft x 7ft door is not truly necessary.

In either case, introducing the oil hot isn't a problem, but... I don't know. I think I might throw an old pc into it (always a celeron sitting around waiting to be recycled), put it on vacuum for a day, then pull it out and see if it still works. Hmm. Will let you know in about 24 hours time how that goes. It's due for a cycle tomorrow
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