The dual core i3 6100 at 3.7ghz will outperform the OLD 8 core FX8370 and it will do it for less money as well.
If you're building a new gaming PC, any AMD cpu is a poor choice right now.
The 8370 has 8 cores, but they are all very weak. 99% of all games only use one or two cores.
A couple of very strong cores is a lot better than a bunch of weak cores.