Oh, that? Don't bother. Just get a card that's fairly cheap and good. I looked into it at one point with my 780G mobo and I remember thinking "you've got to be joking"
So you'd be better off with a 4670 or 5570 or something along those lines if you want it to be really cheap.
Do you think getting a 770 mobo with a 4670 wont make a huge difference?