Need help choosing a graphics card.

[temporary123]

I have to choose between three different graphics cards as they all are the same price.
Which one is best?


MSI Twin Frozr GTX 660 2GB 192bit DDR5 Overclocked Card
2 x GIGABYTE HD 7770 1GB DDR5 OC Cards In XFire
MSI HD 7870 2GB 256bit DDR5 Overclocked Edition Card

 

[ASHISH65]

MSI HD 7870 2GB 256bit DDR5 Overclocked Edition Card is the fastest among them