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So, to clarify, there are two issues currently being worked on in the amd64_edac module. 1. For Family 19h Models 70h-7Fh all UMCs are not enumerated by the module. 4 are present but only 2 are enumerated. Currently, required approvals are being sought to upstream the fix. I think this is the issue being encountered by Sebastian from the dmesg logs and lshw output provided in this thread. 2. For calculating DIMM sizes, the module does not consider both Address Mask and Address Mask Secondary registers. Consequently, for non-power-of-2 DIMMs, the memory size logged by the module is inaccurate. I think this is the issue being encountered by Žilvinas. The patch that Boris asked you folks to try out fixes the second issue. Fix for the first issue has not yet been submitted. > I may not have built the kernel correct though... I did not had an environment to do that and just set one up. Or do I need a newer kernel version to apply the patch to? Sorry for the noob questions... > > Best, > Sebastian -- Thanks, Avadhut Naik