I have seen positive reports about the X570 Taichi. And screenshots from its BIOS confirmed that it has the ECC memory options:
Original author for those screenshots: techpowerup.com via Grundlagenartikel - X570-Boards mit ECC-Unterstützung Seite 2 | igor´sLAB Community
Now I ordered the "Razer edition" of this board, because it has a better chipset fan placement and also some slight updates (2.5GB network, which I don’t use).
Looking at the fully updated BIOS P1.40 as of February 2021 it seems to be missing the menu “AMD CBS \ UMC Common Options \ Common RAS” for ECC settings. I can only see the “DRAM Memory Mapping” menu but not the “Common RAS” menu!
Did Asrock actually remove those options for the Razer edition???
Memtest86 v9 claims that ECC memory is present and enabled:
Using only 1 DIMM, the Samsung 2666 ECC (M391A4G43MB1-CTD) memory has extreme overclocking potential, in my tests was stable up to 3666 without even raising the voltage above the default of 1.20V.
However even when trying different overclocking and and undervolting combinations for multiple hours: The computer either reboots during Memtest86 testing or it completes multiple test runs without error! I never get a corrected ECC report with Memtest86. This makes me suspicious if ECC memory actually works.
Did Asrock remove ECC support from the X570 Taichi Razer edition board variant?