Lots of misinformation in this thread.
Lets clear up all the information here.
With single gpus, such as a gtx 970:
Whether you have an i5, i7, or xeon, overclocked or not, your fps will be the same, as you are still bottlenecked by your gpu.
With a 980/980ti, a locked i5 will have a very small bottleneck, while an overclocked i5, or any i7/xeon will have no bottleneck.
The most common xeon, the e3 1231 v3 on the lga 1150 socket performs pretty much identically to an i7 4790, for 60-100 dollars less. The only difference between a xeon and an i7 is the xeon has ecc support and other servergrade features and are designed for 24 hr operation, other than that they are identical to there desktop counterparts, they use the same architecture. Xeons, just simply have more cores with a lower clock speed on the very high end.\
Skylake has a 5% performance gain over haswell in gaming, not 10-15%.