Hey everyone, I was wondering if you could help me out here. Right now Im thinking of upgrading from my Nvidia 7300 GT to one of the DX10 cards. Specifically a, EVGA GeForce 8600 GTS at 675 Mhz Core Clock Speed. I feel this is enough for a start on DX10 to play games like Crysis, I don't need it maxed out by any means. But here is where I need your help, in my tower I have a 400W power supply, will this be enough to power this card and my other specs?(one 320 gb hard drive, two dvd burners, intel core 2 duo 6600, 2 gigs of ram). Last question I could use some help with is right now I have Windows XP, now do I need to upgrade to Vista to be able to run the DX10 or is XP capable of running DX10 as well? Thanks a bunch buys!