Bottom PSU cases

Having the PSU at the bottom of the case with the fan facing the bottom of the case is basically to allow the psu to draw cooler air in directly from under the case allowing it to run cooler and more efficiently.
Most case's ive seen with the psu mounted at the bottom have extra breathing holes to facilitate this.
It can help with keeping your case cooler as the psu will be producing less heat as the excess heat from the CPU and GPU which is not drawn out of the case by the exhaust fans is not drawn into the psu.
 
sir-les-mp said:
Having the PSU at the bottom of the case with the fan facing the bottom of the case is basically to allow the psu to draw cooler air in directly from under the case allowing it to run cooler and more efficiently.
Most case's ive seen with the psu mounted at the bottom have extra breathing holes to facilitate this.
It can help with keeping your case cooler as the psu will be producing less heat as the excess heat from the CPU and GPU which is not drawn out of the case by the exhaust fans is not drawn into the psu.
Click to expand...

But by having the psu fan facing down on the case, your kind of suffocating it, yeh you might be getting cooler air but it wont be getting as much. So the fan has to work harder to keep the psu cool, but thats if theres no vents on the bottom of the case.. Surely to god thats just common sense as ive posted in my other thread??
 
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sir-les-mp said:
Having the PSU at the bottom of the case with the fan facing the bottom of the case is basically to allow the psu to draw cooler air in directly from under the case allowing it to run cooler and more efficiently.
Most case's ive seen with the psu mounted at the bottom have extra breathing holes to facilitate this.
Click to expand...
Too bad they often lack air filter.
I've seen some horribly dusty PCs with PSU on top (in exhaust end of airflow) and didn't even want to think about opening PSUs because of seeing how dusty mesh in intake of PSU was.
In that situation PSU won't be anymore cooling well and eventually there's even fire hazard.
(depending which one is achieved first: frying point of semiconductors or dust's ignition temperature)

It can help with keeping your case cooler as the psu will be producing less heat
Click to expand...
Amount of heat produced by PSU depends only on power drawn by components and PSU's efficiency at that output power.
Haven't seen any review of quality PSU showing significant efficiency difference between free air and hot box tests.
 
Phil2008 said:
But by having the psu fan facing down on the case, your kind of suffocating it, yeh you might be getting cooler air but it wont be getting as much. So the fan has to work harder to keep the psu cool, but thats if theres no vents on the bottom of the case.. Surely to god thats just common sense as ive posted in my other thread??
Click to expand...

You can try it out for yourself if you want....
Get a fan and place it on the desk, and you wont feel any air comming from it, but as you lift the fan up air willl be able to pass through it,, Ppl say 3mm is enough clearance but I dont agree cos you try a fan with a 3mm of clearance with the fan on the table, and then give it more, I can garantee you more are will be able to get through the fan as its lifted higher off the table

So I say If you want the fan facing on the bottom of the case, either make sure its got at least a 10mm gab between the floor of the case and psu, or cut a 120mm hole in the case where the fan sits.
 
Interesting arguments about fan PSU positioning. Still not sure if it is 'Much' better though. I will have to look into it a bit more. Read more reviews. Some nice looking cases with bottom PSU positioning.
 
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