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question about power supplies

Last response: in Components
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Anonymous
a b ) Power supply
December 28, 2000 12:17:35 PM

I was wondering which way does an atx power supply push air? it feels like its coming out of the back of the case but i can't tell. I was told that they actually suck air into the case but I can't feel any wind coming from the openings in my supply. im asking this because I want to add a case fan to my system.
December 28, 2000 4:11:12 PM

right now, Intel's specification of ATX cases/mobos/power supplies makes the direction of Power fan optional -- in other words, there really isn't a way for us to tell you for sure:( 
Long time ago, all (or at least majority of) cases pushed air out... then, ATX pushed air in, in an attempt to cool the processor without active fan on CPU itself. Obviously today that's almost silly, since you MUST have active cooling on CPU anyway, so manufacturers are free to put the fan whichever way they please:) 
December 28, 2000 4:12:17 PM

take a piece of paper and experiment, it shouldn't be too difficult to figure it out:) 
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December 28, 2000 6:05:10 PM

All the fans I've seen on power supplies blow out. I think (but I'm not sure) that the new ATX 2.03 standard calls for fans to blow out.

I think as a general rule if a fan is in the top half of your case it should blow out and if it is in the bottom half it should blow in (because heat rises).
December 28, 2000 7:03:25 PM

It probably blows out. But it is hard to tell because most powersupplies are designed to be quiet and so the fans run slower. Also, some fans in powersupplies are temp controlled and your case would have to reach something like 60C for the fan to work at its peak.

This is why case fans are important. So put a couple in.
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