So as of now, I'm trying to run 3 LG 25UM65-P monitors along with my Asus VG248QE off of my GTX 970 with old I/O. the problem is that with all four monitors set to extended, my Aero turns off. since I have a black theme installed, having aero off really destroys my desktop. I've tried doing the registry edit along with many of the other "common" fixes to aero disabling, but the only thing that has worked so far is disabling one of my monitors (the VG248QE) then restart my computer to get aero running again. But as soon as I extend to the VG248QE again, aero automatically disables. I'm not sure if this is a graphics limitation or a software limitation, because while I was waiting for a functional displayport cable to be shipped to be, I was running all four of these off of my 970 along with my old 660 that is still lying around, and I had no problem with aero.
I realize its a long shot, but I figured with the number of people using multiple 4k monitors increasing maybe someone has ran into the same problem.