BCLK stands for base clock
"In Intel Core i7, i5, and i3 systems, practically all of the important frequencies (like the CPU and RAM speeds) are simply multiples of the base clock rate (BCLK) for the system, so as you increase BCLK to overclock the processor, they’ll all get overclocked (by default). However, most of these components use multipliers, which can be lowered to limit their impact on finding your maximum BCLK."
The Xeon chips are "ok" for gaming, but their main purpose is for computer work and servers which means they can run allot of tasks. They are very expensive and same with the EVGA SR boards. So you should get an i5 or an i7