With a capable motherboard you can get the FX 6350 higher than 4.2 GHZ but honestly.....judging by the single core performance.....there is little or no difference at all between them 2 when it comes to gaming, even though Win10 will distribute the load across all 6 cores on the FX 6350. May I ask what power supply do you have and what motherboard? Wanting to OC is very different than being able to OC.