...couple of heavily displaced geo with high res 32bit exr for displacement and other high res textures all surrounded by lots of other scattered geometry and rendering it all at some huge resolution, and I believe even with 64Gigs of ram I'd be instantly on the edge of possibilities :D... Having the cash, I get a 3dboxx with 512GB ram :D lol... But yeah, for now I guess getting a 3770 with 32GB for half the price of 3930 and 64GB sounds pretty good...