I have an i7-4770k, gtx 770 4g, and 16 gigs of ram. I can run gta on ultra without msaa at about 60 fps and if i turn on msaa to even x2, my performance goes to h--l. Also, I notice that in task manager my cpu usage is at %100 and I have quite High temps, my cpu cooler goes crazy, and if i minimize to desktop everything is really slow. The game doesn't use much gpu power. Anyone now a fix?