You should be more than fine with that PSU... From the wall on my 780 GTX, 4770k OC to 4.4ghz, 16gb 1600mhz oc to 1866, 3 256gb ssd, 2 hd and 17 fans (corsair 900d). corsair h110 I never see my computer pull over 450W from the wall on a kW meter.
GeForce GTX 780 Ti - On your average system the...