Going to agree that FX-6300 isint worth it, 8 or Intel quad.
Secondly about those FX-8320e's and other e chips, my friend said just today that he had to disable from regular 8350 that turbo core and let it stay high because after few mins R9 290 dipped to 30fps at CSGO and Borderlands.
Just saying that you may have to do that too, which kinda kills e's purpose.