Follow-up: Just learned that so far AM5 is actually a regression compared to AM4[0]. The best they can give is exactly 16 usable lanes (4 of total 20 reserved for chipset). Zen4c models only give you 10. Between this and Pluton I'm quickly losing interest in AM5...
[0]: OK, total bandwidth is still obviously up because we have gained a PCIe generation but still I'd have expected available lane-count to not drop.
AM5 is not a regression from AM4; it adds four more PCIe lanes. The laptop chips repackaged for the desktop socket don't have as many lanes, because laptop chips don't need that much IO.
[0]: OK, total bandwidth is still obviously up because we have gained a PCIe generation but still I'd have expected available lane-count to not drop.