Hi! I'm not sure wich one I should buy. I'm thinking the Asus GTX 650 Ti boost 2gb and the Msi Gtx 660. GTX 650 cost 170euros and the gtx 660 180euros. GTX 650 supports the OpenGL 4.2 and the gtx 660 doesn't. I'm not sure what the OpenGL 4.2 is but wich one is better?