"Why such a low resolution for a card that strong?"
If I remember right, he uses the VR goggles which only support 800x600, but I could be wrong...happens a lot.
As for the 192 Drivers, I think that's what I'm running on a GTX 260, works fine, maybe it's only buggy for 285s? Or maybe it changed some setting in the Nvidia Control panel that capped it at 28?