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So I think we should already be sufficiently up to date for this > patch, but I don't know (and couldn't find anything on the web) about > the details of AMD microcode versioning. AMD microcode version is the bottom byte.  The higher bytes are actually Family/Model/Stepping on all recent CPUs. So, as for your CPU, the 0xb0021xx part means Turin (non-dense) C1 stepping, and revision 0x62 is the latest available in linux-firmware. Either way, you're fixed to AMD-SB-3029 ~Andrew