Based on the information you've given, plus a few assumptions on my part, the PSU size calculator at http://www.extreme.outervision.com/PSUEngine suggests you will only need 431W. Even allowing a 30% cushion, your PSU should be fine.
------------------------------There is ALWAYS a drone. Exactly where, or how many drones you will encounter may vary, but that there will be at least one will not.
Reply to jtt283
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