[zinekeller]

Small nitpick: if I remeber correctly, AMD now uses 12nm process from GloFo now instead of 14nm (due to PCIe 4 requirements).

[dragontamer]

If so, it hasn't changed since Zen 2. IIRC, AMD is on record saying that Zen2 / Zen3 have the same I/O chip, and that only the 7nm stuff is changing.

Zen 2 has PCIe 4, so you could very well be correct.