I folded on a 5770 and a 650ti boost in the same rig, when I installed I put in the 5770 first in 2nd slot and loaded drivers made sure it was working then I installed the 650 in the 1st slot and installed drivers for that, made sure it was good, and I was running it with a FX4100 and my ppd was what it should be for both cards, you could try finishing your WU'S and then reinstalling everything making sure to use some sort of driver removal tool in safe mode to get rid of all traces of old drivers, and see if that will get you the ppd bump you should be seeing, my 650 and FX 6300 put out between 20k and 40k ppd depending on WU. As C_D illustrated your 760 should be much higher.