The 1366 socket uses more power then SB when overclocked, though so does the 480 compared to the 580. From this and my own personal experience I would highly recommend going up to a 1kW power supply if you plan to overclock everything.
At 1.375V vCore + 580s rather heavily overclocked themselves they can pull more then 950W from the wall.
__________________ Here I am: here I remain
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