I've got a pretty good rig ( GTX 970 4GB, i5-4690k @ 4.3Ghz, 16GB 1866Mhz ram, Antec NEO ECO 620W) and I currently have to 1080p screens. I would like to get a third one but I am unsure if I would have enough power to drive the displays. Could I possibly get a second cheap GPU and use that for the third monitor? Would games lag when I play them on that monitor?