Power consumption

The recommended PSU for the GTX 570 is 550 Watt, and it's maximum power draw is around 219 Watt approx.

So you should be fine.
 
If you are running over clocked CPU at higher volts and a raid array of 8 disks, 4 optical drives, and a whole heap of other stuff you might struggle. Otherwise you'll be fine :)
 
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