Alright, so with the new information that you already have an FX 8350 and Arma only runs on one thread.. You should still get over 60, but maybe not much higher. I personally have not tested how demanding Arma 3 is on the CPU, but I know from hearsay that it is extremely intensive GPU-wise, so adding a second GPU should significantly boost your performance. With that, plus the overclock, you should be fine.