PSU Facing Up Or Down In A NON Vented Bottom Case?

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Phillyfan112

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Oct 8, 2013
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Hi everyone,

I have had my power supply for about 2 or 3 years now and I have always had the fan on it facing upward instead of downward. This honestly seemed like the logical thing to do so the fan could do its thing with air. However, today I watched a PC building video from LinusTechTips and he said, and was showing, that his psu was facing downward to the bottom of the case, BUT the case he was using had vents or something of the like at the bottom of the case. Now, the entire reason for me changing it from up to down would be for cables. As of right now the cables are stretched and I actually can't even get the top motherboard connector connected without going straight up through the case. I want all my cables to the back and flipping the PSU over (downward) would make me be able to achieve this. I've looked up threads about this and people say you can do it but I still have yet to find a thread stating there were no vents at the bottom, as my case is just metal. If I turn the fan on the PSU downward facing the bottom of the case, wouldn't this mess up the cooling fan by not allowing any air to get through? Or does it really not matter?

Any help would be appreciated!

Thanks
 
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lowriderflow

lowriderflow

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i disagree with USAfret...

what case do you have?

even if your case doesnt have vents on the bottom,
they generally have tabs or some mount points for the PSU so that it's not laying directly on the bottom of the case.

as long as there is a small gap, even without vents... you can mount it fans facing down. That's preferable, so your PSU can pull cold air from the bottom of the case.

they dont need much airflow typically.


if its a $20 case or something, and the PSU literally sits on the bottom of the case, then you would not want to mount it fan down.

 
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USAFRet

USAFRet

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True.
If there is a little gap, it should be pulling enough air.
 
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Phillyfan112

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Oct 8, 2013
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The case is an Antec 900 mid tower case. Was 160 dollars at the time of purchase. There are 5 fans in the case. A 250mm fan at the top exhaust, a 120 at the top back exhaust, 2 front 100mm fans blowing air in the case and a side mounted fan exhaust. Does this work?
 
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geofelt

geofelt

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Oct 9, 2006
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The purpose of a psu fan is to cool the psu, nothing else. A psu operates equally well upright or upside down.
You do need to allow it to intake air. Preferably from the outside, but from within the case is ok. What you should not do is block that intake.

Often the aux 4/8 pin cpu connectors are a long reach for a bottom mounted psu. Solve that by buying a extender cable for about $5
 
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