If it helps, the ASRock B550M Pro4 supports ECC. At least when paired with a Ryzen 5600X and 4x 16GB (Kingston KSM26ED8/16HD @3200MHz) memory modules. It's wh

If it helps, the ASRock B550M Pro4 supports ECC. At least when paired with a Ryzen 5600X and 4x 16GB (Kingston KSM26ED8/16HD @3200MHz) memory modules. It's what I've been using for 15+ months as my main development desktop. This is how they show up in the system (Linux) from dmidecode: Handle 0x000F, DMI type 16, 23 bytes Physical Memory Array Location: System Board Or Motherboard Use: System Memory Error Correction Type: Multi-bit ECC Maximum Capacity: 128 GB Error Information Handle: 0x000E Number Of Devices: 4 Handle 0x001A, DMI type 17, 92 bytes (this section is repeated 4 times though, once per DIMM stick) Memory Device Array Handle: 0x000F Error Information Handle: 0x0019 Total Width: 72 bits Data Width: 64 bits Size: 16384 MB Form Factor: DIMM Set: None Locator: DIMM 1 Bank Locator: P0 CHANNEL A Type: DDR4 Type Detail: Synchronous Unbuffered (Unregistered) Speed: 3200 MT/s Manufacturer: Kingston Serial Number: [snipped] Asset Tag: Not Specified Part Number: 9965745-028.A00G Rank: 2 Configured Memory Speed: 3200 MT/s Minimum Voltage: 1.2 V Maximum Voltage: 1.2 V Configured Voltage: 1.2 V Memory Technology: DRAM Memory Operating Mode Capability: Volatile memory Firmware Version: Unknown Module Manufacturer ID: Bank 2, Hex 0x98 Module Product ID: Unknown Memory Subsystem Controller Manufacturer ID: Unknown Memory Subsystem Controller Product ID: Unknown Non-Volatile Size: None Volatile Size: 16 GB Cache Size: None Logical Size: None