It looks like the gap has narrowed, though TDP might not mean what it once did. The comparison I remember is a 64 core Rome chip against two 28 core xeons where

It looks like the gap has narrowed, though TDP might not mean what it once did. The comparison I remember is a 64 core Rome chip against two 28 core xeons where the Rome one was significantly faster and something like 1/3 the power consumption of the dual. I've got one of those 64C chips and haven't followed the market as closely since.