Yet many new AAA games out recommended requirments list an i7/or 8 thread amd cpu. That trend we will see more and more of.
i5 is a very capable gaming cpu, but you can still get better performance out of an Xeon or i7, over an unlocked i5, either way, for games right now you cant go wrong either way, even a g3258 oc to 4+ ghz get into same league as i3/i5/i7 in most any game out there. I just personally would choose the Xeon, its same price you get 8 threads, almost identical performance in ipc, and you dont have to worry about a coooler, temps, or life of the cpu, and most likley stand the test of time better than an unlocked i5, though its all in the lottery in the chip you get (note Xeon cpu are usually binned as server rigs and as such tend to be to last longer)