Thanks for the confirmation. I've read articles at <URL="http://www.anandtech.com">Anandtech</A> which rather scientifically monitored power consumption. They say a system like mine will run 146 Watts at idle and 269 Watts under load (speaking mainly of the CPU and video card). They say that with two cards in SLI, they've measured 211W at idle and 327W under load. I want to be ready for that.

So, if a "750W" PSU doesn't draw that all the time, than at least it's ready for whatever load I throw at it. No harm in oversizing it, except cost, which is negligible compared to the damage done to my hard drives from under powering them.