The wattage of the PSU doesn't matter nearly as much as the brand. I'll say it again because most people disregard the fact: the wattage of the PSU doesn't matter nearly as much as the brand. The shitty PSUs that come with cases (RAIDMAX and POWMAX) are usually 350-400w, yet they blow if you attempt to run more than one hard drive. If you buy a 400w Enermax, Sparkle, or any other top of the line PSU, it'll run anything you throw at it, probably even dual 7800 GTXs. Seriously. My brother's 400w Enermax is current running 5 hard drives, a 6800 Ultra, and all sorts of other crap with ease. I have a 350w Enermax and it is simply amazing. It's completely silent and runs my 6800 Ultra easily.
A 350w Enermax is the equivalent of a 500-600w generic PSU. One test to determine how "good" a PSU is lies within it's weight. Pick it up! If it feels cheap and lightweight, it's a piece of shit. If it's heavy and feels sturdy, it's a good PSU. Good PSUs have lots of heatsinks inside them, one of the contributing factors to the weight.
If you're worried about your PSU, just buy a good one. Go to NewEgg and buy a 350 or 400w Enermax and not worry about it ever again. Your 500w may actually be a shitbox if it's a low quality brand!
-Lasereth
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"A Darwinian attacks his theory, seeking to find flaws. An ID believer defends his theory, seeking to conceal flaws." -Roger Ebert
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