Xeon E3 and the iCore series both run on the 1150 platform so they are for the most part interchangeable. for example I could yank my chip right now and drop an i7 in there and it would work.
The Xeon E5 and E7 chips are what Eximo is talking about. For those chips you need a 2011 platform and as he pointed out, you can get some crazy stuff. 12 core chips with 24 threads an 30MB cache oh my
But those ae 100% enterprise solutions and have little practical use in the desktop world. For you and me 4 cores is plenty. When I first got my Xeon I opened up every application I had an threw a few hundred Gigs of file transfers around and I think I even streamed a few videos....and I think MAYBE it pushed my CPU to 40%. For my average workload I rarely top 10%. the same will be true of an i7.