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No, it depends more on the quality of the power supply. A high quality 305 watt is better than a cheap 500 watt. I've run under minimums with quality units - I have a customer that ran a GF4 Ti4400 (300 watt recommendation) in a Dell with a 200 watt Delta unit with no issues. Minimums are published as recommendations based on average to lousy quality to cover themselves. PSU calculators are pretty much useless due to the widely varying quality of units. It's the rail amperage and stability that really counts. I'll take a $50 350 watt unit made by someone like FSP over a $20 600 watt unit made by L&C in a heartbeat.
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