When you bought your 290 you probably didn't uninstall previous drivers and didn't install new ones.
My suggestion would be either buy again/use the 290, properly install drivers, and upgrade your CPU to an 8320 or 8350. I have the 8320 and love it
Also I'd suggest getting a 600W PSU for the new 290, from Corsair, XFX, Seasonic etc. That SuperFlower sounds a bit dodgy.