so, i have an nvida 560 in my gaming/3d modeling/work rig. when i'm not doing anything intensive i let it mine. might as well, since it doesn't interfere with whatever i'm doing.
but i'm wondering - i've got a second pci-eslot on my mobo. (asus p755d-e, fyi) and i've read that i could run BOTH the nvidia card AND an ATI at once, under windows 7. the ATI would of course do nothing but mining day in day out.