They also support ECC UDIMMs with ECC enabled, which has been the "PRO" series APU killer feature on AM4 for me. The non-"PRO" APUs will run fine with ECC UDIMMs, but cannot make use of the extra parity information (maybe for reasons of market segmentation - I don't know if anyone outside of AMD knows). This is probably less of a concern with DDR5 platforms and their "on-DIE ECC" (which you cannot monitor for Correctable Errors at least, afaik), but it's still gonna matter for me.