Well, in the class of processors I buy, near lowest speed Xeon E3 family, Sandy Bridge -> Ivy Bridge had a small price decrease, a 100MHz speed increase, and ad

Well, in the class of processors I buy, near lowest speed Xeon E3 family, Sandy Bridge -> Ivy Bridge had a small price decrease, a 100MHz speed increase, and added graphics (resulting in a rather big systems savings), Ivy Bridge -> Haswell is exactly the same price (say $6 less after inflation) and adds another 100MHz, plus an incrementally better microarchitecture and I'm sure better graphics. There's also more integration, perhaps resulting in lower motherboard prices, and Skylake has SKUs integrating the PCH at the cost of fewer PCIe lanes. We certainly aren't seeing the big jumps from previous generations, but it isn't entirely static. And this is a segment with much less pressure on power consumption than mobile, and perhaps other Xeons that go into huge machine rooms that I'm read are now more power limited than anything else.