Do you really understand your power consumption needs on your system? Think that your 250 watt power supply on your Dell or Gateway might have a "skimpy" 12V rail that's totally maxed-out to your processor?
Check this very informative article out for an answer:
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http://firingsquad.gamers.com/guides/power_supply/default.asp
Check this very informative article out for an answer:
It certainly helped me!
http://firingsquad.gamers.com/guides/power_supply/default.asp