I built up this system last year (- the gtx 480) and am looking to add in a gtx 480. I will then be running four monitors. Will adding in this gtx 480 cause any problems at all? It is for gaming and 3D design. The i7 is still at stock speed and i have never had any problems with it running two monitors.
Will it cause problems that one gfx card is running dx10 and another dx11?
it will be fine if you can power the lot,the only compatibility issue would be if you wanted to sli them,be assured there will be no problem if you running them independently regardless of dx class of the card.