Solution


your powr supply will run 7950 CF.here's guru3d's power consumption test for 7950-
http://www.guru3d.com/article/radeon-hd-7950-crossfire-review-2-and-3way/5
Here is Guru3D's power supply recommendation:

Radeon HD 7950 - On your average system the card requires you to have a 500~550 Watt power supply unit.
Radeon HD 7950 Crossfire x2 - On your average system the cards require you to have a 700 Watt power supply unit as minimum.
Radeon HD 7950 Crossfire x3 - On your average system the cards require you to have a 850~900 Watt power supply unit as minimum.
Note:they use a very power hungry test setup-...


your powr supply will run 7950 CF.here's guru3d's power consumption test for 7950-
http://www.guru3d.com/article/radeon-hd-7950-crossfire-review-2-and-3way/5
Here is Guru3D's power supply recommendation:

Radeon HD 7950 - On your average system the card requires you to have a 500~550 Watt power supply unit.
Radeon HD 7950 Crossfire x2 - On your average system the cards require you to have a 700 Watt power supply unit as minimum.
Radeon HD 7950 Crossfire x3 - On your average system the cards require you to have a 850~900 Watt power supply unit as minimum.
Note:they use a very power hungry test setup-
http://www.guru3d.com/article/radeon-hd-7950-crossfire-review-2-and-3way/8
Mainboard

MSI Big Bang XPower X58

Processor

Core i7 965 Extreme @ 3750 MHz

Graphics Card

HIS Radeon HD 7950 / AMD Reference Radeon HD 7970 / PowerColor Radeon HD 7950 PCS+

Memory

6144 MB (3x 2048 MB) DDR3 Corsair @ 1500 MHz

Power Supply Unit

1200 Watt

Monitor

Dell 3007WFP - up to 2560x1600
your system is much more power efficient.your psu(xfx 650) provides 53 amps which is sufficient to run your system with 2x 7950.
enjoy ;)
 
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