Should I get a 750W power supply for this build?

ProfasLovesYou

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Sep 19, 2013
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Video: GIGABYTE GV-R787OC-2GD / Radeon HD 7870/ 2GB GDDR5
MotherBoard : ASUS P8H77-V LE
Proccesor : Intel Core i5-3570K
RAM : DDR3 Patriot ViperX 3RD Red 8GB (2x4GB) 1600MHz CL9 1.5V, XMP1.3
Harddisc : Seagate SV35, 3.5'', 1TB, SATA/600, 64MB

 
For a system using a single GIGABYTE GV-R787OC-2GD graphics card GIGABYTE specifies a minimum of a 500 Watt or greater system power supply. The power supply should also have a maximum combined +12 Volt continuous current rating of 33 Amps or greater and have at least two 6-pin PCI Express supplementary power connectors.

For a system using two GIGABYTE GV-R787OC-2GD graphics cards in 2-way CrossFireX mode GIGABYTE specifies a minimum of an 650 Watt or greater system power supply. The power supply should also have a maximum combined +12 Volt continuous current rating of 50 Amps or greater and have at least four 6-pin PCI Express supplementary power connectors.