After publishing this post, I was alerted to the fact that there are some AM5 motherboards that do officially support ECC. ASRock's Rack line supports it, for

After publishing this post, I was alerted to the fact that there are some AM5 motherboards that do officially support ECC. ASRock's Rack line supports it, for example: https://www.asrockrack.com/general/productdetail.asp?Model=1U4LW-B650/2L2T#Specifications https://www.asrockrack.com/general/productdetail.asp?Model=1... This ASUS motherboard also claims to support ECC: https://www.asus.com/us/motherboards-components/motherboards/proart/proart-x670e-creator-wifi/techspec/ https://www.asus.com/us/motherboards-components/motherboards... Neither of those were out at the time I originally got my AM5 motherboard (which was right as they came out -- the performance numbers were so good I couldn't help but spring on one early.)