Here's an interesting mod that I picked up.
Flip your PSU. Yeah, flip it over, and cut a blowhole (well, suckhole) for its intake.
This way, your PSU is sucking in cooler air, which makes it run cooler. Cooler = more stable.
To make up for the exhaust you lose, put in a blowhole exhaust, or a fan in the door placed at the top.
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R.I.P. Danny L. Trotter
... 14 Nov 1945 - 4 Sept 2009