It really depends. The FX4170 has a higher clock speed, as such it will probably perform better than the 6100 at stock speeds. However, if you were to overclock the 6100 to 4.2GHZ to match the 4170, for multithreaded applications, the 6100 at 4.2GHZ would outperform the 4170. Although for gaming purposes, there are stronger CPUs that may be worth considering both from AMD itself in the form of Phenom II 965-980 models or Intel i3s.