Well the important question is what resolution do you plan on playing your games at?
If you want to sli 580s while overclocking them and the 2500k you'll definitely need a 850W power supply as my own system (i7 940 with 2 580s) could pull more then 900W if i had everything extremely overclocked while running crysis 2 on ultra settings
__________________ Here I am: here I remain
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