Power supply requirements

I am building a gaming computer and I was planning on getting a power supply that could support two of my chosen video card when I needed to upgrade my computer a few years down the road.

My question is, how powerful should my power supply be to support two graphics cards (AMD Radeon HD 7850)? What I have found out about the card is that it should be in a system with at least a 500W power supply, but is 650W enough to support two of them should i choose to buy another a few years down the road?

My planned build is
PCPartPicker part list: http://pcpartpicker.com/p/ccH6
Price breakdown by merchant: http://pcpartpicker.com/p/ccH6/by_merchant/
Benchmarks: http://pcpartpicker.com/p/ccH6/benchmarks/

CPU: Intel Core i5-2500K 3.3GHz Quad-Core Processor ($169.99 @ Microcenter)
Motherboard: ASRock Z68 Extreme3 Gen3 ATX LGA1155 Motherboard ($126.04 @ NCIX US)
Memory: G.Skill Ripjaws Series 8GB (2 x 4GB) DDR3-1600 Memory ($45.99 @ Newegg)
Hard Drive: Western Digital Caviar Blue 500GB 3.5" 7200RPM Internal Hard Drive ($74.00 @ B&H)
Video Card: MSI Radeon HD 7850 2GB Video Card ($209.99 @ Newegg)
Case: Cooler Master Storm Enforcer ATX Mid Tower Case ($69.99 @ Newegg)
Power Supply: Corsair 650W ATX12V / EPS12V Power Supply ($79.99 @ Newegg) <-- the part in question
Optical Drive: Asus DRW-24B1ST/BLK/B/AS DVD/CD Writer ($24.98 @ Newegg)
Total: $800.97

Thanks in advance for your help.
2 answers Last reply
More about power supply requirements
  1. Yeah should be enough
  2. AMD recommends a 575w power supply for HD 7850 Crossfire. That assumes a "generic" power supply.

    The Corsair 650TX is a very good power supply and is a fine choice for the listed system.

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