Sapphire 5850 2gb vs 6950 2gb?

Anastrophy

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Dec 31, 2010
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Hello,
I have a
ASUS P7H55-M PRO motherboard running a
Intel Core i5-650 Clarkdale 3.2GHz 4MB L3 Cache processor with
4gb CORSAIR XMS3 4GB (2 x 2GB) 240-Pin DDR3 SDRAM DDR3 1333.

I just recently bought
SAPPHIRE Toxic 100282-2GTXSR Radeon HD 5850 (Cypress Pro) 2GB 256-bit Video card, and it hasnt even shipped yet, but I'm now looking at the
Sapphire 100312SR Radeon HD 6950 Video Card - 2GB.

Since I only can have 1 video card until I upgrade the mobo, should I cancel the order on the 5850 and get the 6950? I play crysis and other games like that, and I want to know WHICH ONE to pick and WHY.

Thanks so much in advance, I can't find a clear comparison between the two.