Not sure how much power needed

Ok, i'm not sure just how much power i'm guna need to run my computer. current specs are...

AMD Phenom II X4 975 (3.6ghz)
G.SKILL Ripjaws Series 12GB DDR3 (1600mhz)
GeForce GTX 460 (Fermi) 2GB (700mhz core clock/1400mhz shader clock/3600mhz mem. clock)
SATA II 3.0/7200 rpm/500gb HD
ASUS M4A87TD EVO AM3 AMD 870 SATA 6Gb/s USB 3.0 ATX AMD Motherboard
850 watt PSU...

Do i have enough power to go from the single video card... to CrossfireX 2 Radeon HD 6950 2GB's?
2 answers Last reply
More about power needed
  1. sorry if the build listed is missing any details... if u need to know more i'll look it up and post it for u =)
  2. 500 watts would be plenty
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