Thanks guys, I really appreciate the answers.
I do monitor my gpu with evga precision. And the only game that came close to 100% usage was Metro 2033.
I got to tell you, the GTX 680 is a great incentive to buy new parts for my computer
yeah, metro 2033 can be really hard on the gpu, so no surprise there
and it should be, it is pretty much as good as it gets on the gpu front these days (though the next gen is coming out before summer