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The Nvidia claim of needing 450 Watt PSUs with their new cards is usually bullocks. You'd need a 450 Watt *crappy* PSU to run their cards, or a 300/350 Watt *good* PSU.
At work we've got fully equipped game PCs with X800Pro or 6800LE cards (and athlon64s, gigs of memory, dual harddisks, etc), all running on 300 Watt Aopen PSUs.
If you need to get a new PSU, get a good brand, look at the 12v line, check the amps there (>18 at least), and then get one. Modern PSUs have two 12v lines, one dedicated to the video card, and the other to the rest of the system.
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