I think that the Athlon II 760K should be fine with that GPU. The Athlon II 760K is almost Identical to the FX 4350 aside from the L3 Cache and the type of MB it uses. Other than that the FX 4350 is roughly about 4%-8% faster. Also it uses the same micro architecture an the Vishera FX series CPUs code named Piledriver. And You can look this up. Dice paid upwards to $8 Million USD for Optimization for their CPUs especially the FX series. Often you will see the question "will my FX 4150 Bottleneck X graphics card" and for the R9 270X you should get pretty much all the performance you can expect.