Hey. I got a late 2012 new iMac with GeForce GT 640M. I've been wanting to play The Witcher 2, which I just bought off of a deal on GoG. However, the performance is piss poor on low settings. That made me look around for graphics drivers for my computer. The game itself, as most games actually, automatically set high settings, so the computer isn't bad. But I can't seem to find any legit drivers for the 600M series of GeForce which address Mac OS X. Any ideas?