failed to prefill DIMM database from DMI data
That seems to me to be the material error.
You've checked out the cpu can drive the dimm, and that seems OK An easier check would be to remove dimm 4. That clears the 'DIMM' bit
Now check out the 'database' and the 'DMI data' bits. This error could be a read error, a write error, or a memory error. It could also be a failure to create the dmi database.