Long answer...it can vary if you use very strong fans (in my case). I'd actually go a little higher just for the headroom cause you seem inclined to be on the borderline requirement for...
-Overclocking
-Expansion
-Maximum load
By all means...I'm no PSU expert...but I've experienced an old Thermaltake ToughPower 750watt that wouldn't let me load my GTX275 SLI system. I do know an X750 is a way better PSU to work with though.
If it's a good quality PSU (as in, it can actually do the advertised 750W which given that it's a SeaSonic it probably can), it should work splendidly for that setup.
Not only is the X-750 just about the best 750W on the market, but its +12V capacity is huge at 62A which is 744W! Yeah, that's 6W shy of its 750W rating. So, this is very much a continuous-rated PSU.
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