see for instance the microcode for family 19, the Zen3, Zen4 family, the microcode update is:
Microcode patches in microcode_amd_fam19h.bin:
-
Family=0x19 Model=0x11 Stepping=0x01: Patch=0x0a10113e Length=5568 bytes
-
Family=0x19 Model=0x11 Stepping=0x02: Patch=0x0a10123e Length=5568 bytes
-
Family=0x19 Model=0xa0 Stepping=0x02: Patch=0x0aa00212 Length=5568 bytes
-
Family=0x19 Model=0x01 Stepping=0x01: Patch=0x0a0011d1 Length=5568 bytes
-
Family=0x19 Model=0x01 Stepping=0x00: Patch=0x0a001079 Length=5568 bytes
-
Family=0x19 Model=0x01 Stepping=0x02: Patch=0x0a001234 Length=5568 bytes
-
Family=0x19 Model=0xa0 Stepping=0x01: Patch=0x0aa00116 Length=5568 bytes
There is only update for 7 CPUs, before this August update, there was only 3 microcode!!! compare this to the number of CPU they have in this family:
https://en.wikipedia.org/wiki/List_of_AMD_Ryzen_processors
I have a 5600H, family 0x19 and model 0x50, no update, as well as dozens of others AMD cpu.