For our power consumption testing we use the P3 Kill A Watt. Please keep in mind that these numbers are not specific to the power used by the GTX 570 but the total amount of power being used to run the review system.
With our system sitting idle the P3 Kill A Watt indicates that 143 watts of power is being consumed.
When we loaded and started playing Crysis Warhead our power consumption increases by close to 200 watts peaking at 340 watts.
And finally when running Furmark we reached a peak power consumption of 375 watts.
These numbers fall in line with what we would expect when running an overclocked system and a high end graphics card.