Okay, i have written a few threads about my upcoming pc and everyone says that i should get atleast 600w psu, because if not, il get shutdowns etc. Do i really need to get a 600w psu, if i went to http://coolermaster.outervision.com/ Tested everything and it showed that My system will use 420w. DO i really need that overcap and buy 600w or i can go with 550w ?
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It depends on the quality of the PSU! With out knowing your specs I would be guessing anyway!
Don't ever go by what a power supply calculator gives you.
For any single-GPU system, even overclocked, a 550w power supply is plenty. As rolli said, though, you want a quality-built power supply.