Right, I had been debating with myself whether or not I'm going to get one of these monsters, when I discovered that I'll need to upgrade my power supply. Having asked around a bit, I was told I'd be wanting in upwards of 650W, which sounds like an awful lot. I don't want to have matched the cost of my new graphics card in electricity bills within the year, afterall. But imagine my suprise when I read in a review that the GTS version (which I was considering) only requires 400W, while the GTX requires 450. Can anyone sort this out for me once and for all? What are the actual power requirements?