2 upside-downs make it right ;-) The fan is meant to go on the bottom, not
the top of the unit.



"Charlie" wrote in message
...

OK, I've gotten the bug to build my own computer. Having never done this
before I have been lurking on this group for a while and I've been
searching the internet for information. I have decided to build a
computer
based on the Athlon XP processor. I have found that AMD, in their
"Builders Guide for Desktop/Tower Systems" case guidelines, recommends the
use of a "bottom air intake" power supply.

http://www.amd.com/us-en/assets/cont..._tech_docs/260
03.pdf

The logic of this seems obvious yet I have been unable to find a single
power supply with specifications stating that it brings in air from a
bottom intake or fan.

Many power supplies have a fan on the top. I'm unsure why since most of
the
cases I've seen do not have a hole on the top to match. Then I thought I
would just turn the power supply upside-down, but no, the mounting screw
pattern is not symmetrical and the few cases that show the hole pattern
orient the powersupply with the fan up. I did find a site that shows how
to butcher your "incorrectly" built case to fit an upside-down power
supply.

http://www.directron.com/powermod.html

I would have no problem with altering a case or for that matter the power
supply to mount upside-down but seeing as they went to the trouble to make
the screw pattern different top to bottom I figured there must be a
reason.

Am I missing something?

Do some cases have the mounting holes oriented so that the power supply
mounts upside down?

Could anyone here point me to a good 400+ watt power supply with a bottom
intake vent or fan?

Thanks

Charlie