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Is 650W enough for this build?

Will the power supply i have listed provide enough wattage for this build taking in to account i plan to OC the CPU and GPUs? PCPartPicker has the estimated Wattage at 591W. If you all think 650W is not enough i would appreciated suggestions.

Thanks in advance!

CPU
Intel Core i5-3570K 3.4GHz Quad-Core Processor

CPU Cooler
Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler $29.98 Amazon

Motherboard
ASRock Z77 Extreme4 ATX LGA1155 Motherboard $129.99 Amazon

Memory
Patriot Viper 3 8GB (2 x 4GB) DDR3-1600 Memory $38.98 Outlet PC


Storage
Seagate Barracuda 500GB 3.5" 7200RPM Internal Hard Drive $54.99 NCIX US


Samsung 830 Series 64GB 2.5" Solid State Disk $79.99 Newegg


Video Card: crosfire
Gigabyte Radeon HD 7950 3GB Video Card $307.55 Newegg
Gigabyte Radeon HD 7950 3GB Video Card $307.55 Newegg

Case Zalman ZM-Z9 U3 (Black) ATX Mid Tower Case $74.99 -$11.24 $63.75 Newegg 15% off

Power Supply
XFX 650W 80 PLUS Bronze Certified ATX12V / EPS12V Power Supply $79.99 Amazon

Optical Drive
Lite-On iHAS124-04 DVD/CD Writer $17.89
3 answers Last reply Best Answer
More about 650w build
  1. Best answer
    I would go for 750W just to play safe. A 20% extra head room is ok since there will be capacitor aging as the day goes by.
  2. You are going to need more than that for Crossfire. You probably want around 750-850.

    850 is a bit much. I run 2 570's on a 750. And on full load, they apparently use 500W. By themselves.
  3. Best answer selected by Fenring.
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