Actually, a few games have. Crysis 2 (which led on consoles) has "optimum" requirements of a 560ti or a 6850 for 30fps at 1920. Metro, which led on PC, and is insane, had the recommended of a 470 or a 480. It depends if Skyrim is doing any fancy DX11 stuff, then it'll be bumped up a bit, at...