I put about 1/4 page of stealth fabric that covered two sides of the six possible sides of the 300 watt power supply. I also put a 2" square of stealth laying loosely on top of my sound card.
I still use the card deluxe from digital audio labs.
A bit off topic, but anyone use a high end sound card that doesn't have a lot of dongles? I wonder if any expensive $300 or greater soundcards work without adapter dongles.