[paulmd]

The bigger point is that there was no reason to kill X399 support at all. It's the same physical socket, the socket is capable of supporting much more than Threadripper did with it (Epyc uses the same socket for 8 memory channels), and the power consumption has not increased significantly compared to TR 2000 series.

There was no reason to kill TR4. It could have been a "legacy" board with PCIe 3.0 support, like X470 is for the desktop socket.

AMD just killed TR4 because they wanted everyone to buy new boards. The classic Intel move.

(meanwhile Intel put a new generation of chips on X299, while also putting out a compatible X299X socket that increases lane count. Intel doing it right for once, AMD doing it wrong for once.)