Wouldn't do it... the i7/4850 is too much cpu and not enough gpu. you're better off going core 2 quad and an x2 video card. Don't get me wrong, the i7 is a very mean CPU, my friend's got one with a GTX 260OC and running crysis cpu barely does any work, but even my Q6600 only runs 30-40% load. You're just far better off spending the cash you save from the CPU on a better video card. As for Fallout 3, maxing it isn't a problem, even for my older Q66/88GT system.