Talking about this? http://www.bit-tech.net/hardware/2010/12/07/nvidia-geforce-gtx-570-1-3gb-review/9
That's measurements from the wall. Power supplies are rated at DC output, so that value will be lower due to efficiency. Also, you have take into account of the fact that it 330w also take into account the first gen i7-965, which has a higher power draw than the 3770k.