Hi all. Originally, i was going to build a new PC with a single GTX 260 video card. I have since opted to build something a little different though. I was just wondering what size power supply you guys would recommend to me for my new build. The full specs are: CPU: AMD Phenom II x4 955 Black Edition Mobo: Gigabyte GA-MA790X-UD4P RAM: Corsair XMS2 2x2GB DDR2-800 HDD: Western Digital Caviar Black 1TB x2 (for Raid 0) Video Cards: Asus ATI Radeon HD4850's in Crossfire Optical Drive: Asus DRW-24B1LT Cooling the CPU will be the Zalman 9700NT and will all be housed in the Antec Nine Hundred Two gaming case. I was originally planning for a 650watt Corsair Power Supply Unit for this system. But i am beginning to wonder if that will actually be enough for the system. What do you guys think. Is it enough? If not, can you recommend me a good Power Supply? Please dont say stuff like "you should get an Intel CPU and a single better video card" because i have already made my mind up on this system. Thanks in Advance.