Is 650W enough for this build?

[Fenring]

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

 

[ttcboy]

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.

 

[Deemo13]

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.

 

[Fenring]

Best answer selected by Fenring.