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LGA 2011-3 CPUs are keyed differently than LGA 2011 CPUs, meaning you cannot use a LGA 2011 CPU in a LGA 2011-3 socket, nor vice-versa
If Intel did what AMD did just tweaked and modified the same architecture over half a decade, they could have made same socket to last longer, but it would be at the cost losing relatively huge amount of performance progression.Classic Intel daylight robbery.
But yes I do agree that the performance progress for Intel's "core series" over this last 4 gens has be quite pathetic, particularly with Haswell they could have make something with a relatively big increase over the IvyBridge, but instead, they chose to focus their effort targeting the mobile market instead, and left desktop users on the spot of having a not much faster CPU with lower power consumption and better integrated graphic- which means very little to them.
Since when PC gamers are NOT desktop users?999 out of 1000 "desktop users" don't actually need faster CPUs though. Gamers with multiple GPUs do (that's not exactly a huge market), as do people doing serious computation, but they use clusters or GPUs. The vast majority of desktops, which have been dwindling in number for a long time, get by just fine on 5+ year old CPUs.
LGA2011-3 is DDR4 though so it was never going to be compatible with LGA2011.Classic Intel daylight robbery.
Haswell Refresh is still meant to be on the current 22nm process.