look internet about test crysis 3 with different cards with different setings, then choice settings what u wont, then look at minimum of all test of u will found in web, then set 90-95% framerate limit of it
p.s. this only about cards like urs, cards like mine need more subtle princip of set:)
p.p.s. if u have exactly 30-60 drop-jump, so something force vsync, and u have to found what exactly can do this
p.p.p.s. about amd threatening to release soon 7990 must be titan killer will:)
p.p.p.p.s omg! omg! they does yet!