How Much Wattage is Enough? Estimated 420w


I am about to build a PC and on PC Part Picker my PC's estimated wattage is 419 watts. I am looking to get one that will last. I thought the EVGA 600B would be good as it is 80+. I think 80+ means that it will produce 80% or more wattage, which would be 480w. Please give me advise on the amount of wattage I will need.

These are my specs:
AMD FX-8350 4.0GHz 8-Core
Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing
ASRock 970 PRO3 R2.0 ATX AM3+
Crucial Ballistix Sport 8GB (1 x 8GB) DDR3-1600
Sandisk 128GB 2.5" SSD
Seagate Barracuda 1TB 3.5" 7200RPM
Asus Radeon R9 270X 2GB TOP
Fractal Design Define R4 w/Window (White) ATX Mid Tower

Thank you in advance.
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  1. Best answer
    The EVGA 600B can deliver 600watts to the components. The efficiency means that to do that it will pull more from the wall socket, so basically since it is 600watts if on full load 100% from the wall would be 750watts.
    You can easily get away with the 500watt version.
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