[devit]

The article is wrong.

The Xeon E3-1270 v5 goes from 3.6 to 4.0 GHz and only costs 10% more than the i7-6700 (3.4-4.0 GHz)

Also, the Xeon E3-1230 v5 goes from 3.4 to 3.8 GHz (same base clock) and costs less than the Core i7-6700.

In general, you should never buy non-Xeon CPUs if you have the choice, both for desktop and for servers, since ECC memory is essential if you don't want to have a significant chance of having to replace your RAM after discovering mysterious problems with your system.