Help -Which direction do I install my Power Supply

I think it's meant to be mounted "upsidedown" with the fan down.
i have an Antec true psu with two fans and it has an intake fan that will suck air from the inside of the case and one in the back that will get rid of the hot air.
If you still fell unsure just feel with yor hand if it is blowing or sucking air.

If you look at the back of your case, there's generally only one way that you can actually install the power supply, looking at how the screw holes line up. That's why they're offset, instead of in a simple box.

Yes, but all power supplies with lid venting should be mounted upside down to draw heat off the CPU and exhaust it out the rear. Many cases have little space above the power supply for mounting rightside-up and getting air through. Also, having the thing mounted rightside-up creates a heat damn under the PSU.

Some cheap cases mount the power supply rightside-up, I suggest if people have a lid intake in their power supply it should be mounted upside-down, even if they have to drill new mounting holes in the case.

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<font color=red>Only a place as big as the internet could be home to an ego as large as Crashman's!</font color=red>

You're most likely right. Fact being though, never seen a lid venting PSU,a nd if I got one, would exchange it. For that exact reason. Have no problem drilling another hole, do a lot more complicated work than that fabbing up custom parts for my bike and truck, just don't see any reason to be forced to do that on my computer.

But you are correct, just didn't know that such things existed.

The lid intake is the proper design for all ATX power supplies ever since the outset. Companies that have deviated from the standard have hurt the customer by creating a heat dam between the CPU and power supply.

Being the standard, it's found on most good power supplies:

<A HREF="http://www.newegg.com/app/Showimage.asp?image=17-103-91..." target="_new">Antec</A>
<A HREF="http://www.newegg.com/app/Showimage.asp?image=17-103-45..." target="_new">Enermax</A>
<A HREF="http://www.newegg.com/app/Showimage.asp?image=17-103-60..." target="_new">Enlight</A>
<A HREF="http://www.newegg.com/app/Showimage.asp?image=17-104-96..." target="_new">Fortron Source</A>
<A HREF="http://www.newegg.com/app/Showimage.asp?image=17-151-01..." target="_new">Seasonic</A>
<A HREF="http://www.newegg.com/app/Showimage.asp?image=17-103-42..." target="_new">Sparkle Power</A>

If you have an improperly designed case that mounts the power supply rightside-up, you probably should have a better case! But drilling new mounting holes is always an option.


<font color=blue>Only a place as big as the internet could be home to a hero as big as Crashman!</font color=blue>
<font color=red>Only a place as big as the internet could be home to an ego as large as Crashman's!</font color=red>

That about covers only PSU's, I use, so i guess the problem is I've never bought a crappy case. Yeah, know that power supplies are supposed to run like that.

I have a Gateway E-Tower case because of it's high quality materials and construction. Unfortunately it was designed for Gateway, so it had a Gateway power supply hole. Lo and behold, it was also drilled for a full-sized power supply, but the holes were for mounting it rightside-up. Since I was cutting the big hole bigger, I decided to redrill the holes too.

<font color=blue>Only a place as big as the internet could be home to a hero as big as Crashman!</font color=blue>
<font color=red>Only a place as big as the internet could be home to an ego as large as Crashman's!</font color=red>

yeah, in situation like that, would probalby d it. but in general, would return it for a better case(but tend to stick with name brands on cases lately too, as I figure a good case purchase will alst me a long time).