Comparison of AMD A6-6400K and AMD FX-9590 processors by specifications and benchmarks. AMD A6-6400K runs at base clock 3.90 GHz and has 2 threads, and AMD FX-9590 runs at base clock 4.70 GHz and has 8 threads. The architecture and type of processors is different, Richland (Piledriver) Desktop / Server versus Vishera (Piledriver) Desktop / Server. The TDP of the first processor is 65 W, and the second one is 220 W. Compare test scores to see which processor is better.