https://www.anandtech.com/show/12906...w-x399-refresh
https://www.anandtech.com/show/12907...u-need-to-know
Looks like Intel lost the core advantage for their x299 platform, but they used some kind of phase change water cooling for it. I imagine it requires a lot of power and cooling to keep 5ghz.
AMD on the other hand looks like they finally got rid of the dummy dies and went nearly full Epyc, besides the PCIE lanes and memory channels. The slide mentions it has the Zen+ improvements which include XFR2 and Precision Boost 2, both have which increased single core performance for Ryzen quite a bit. Works on existing socket.
Only issue still is preventing programs and threads from crossing the glue too much.