AFAIK, Ryzen 9 3900X do support ECC memory, but it's up to motherboard whether to officially support it or not. There are X570 boards out there with official EC

AFAIK, Ryzen 9 3900X do support ECC memory, but it's up to motherboard whether to officially support it or not. There are X570 boards out there with official ECC support, e.g. ASUS Pro WS X570-ACE[1]. [1]: https://www.asus.com/Motherboards/Pro-WS-X570-ACE/ https://www.asus.com/Motherboards/Pro-WS-X570-ACE/