It's mind bogglingly expensive to make a die, so of course the i5/i7 and e3 use the same die. I've not noticed any xeon premium though, the Xeon E3-1230 for in

It's mind bogglingly expensive to make a die, so of course the i5/i7 and e3 use the same die. I've not noticed any xeon premium though, the Xeon E3-1230 for instance seems to be on the same price/perf curve as the i7-7700 and i7-7700k. Xeon E5's are much more expensive, but that's because it has more cores, ecc, dual socket capable etc. The E3 is basically the same chip as the i7 with different features enaled (overclocking instead of ecc).