There;s a PDF up on the AMD site which a keen-eyed reader has spotted and we"re not too sure what significance, if any, it has.
The 76 page PDF, called AMD Processor Recognition, and which you can find here, has a table on page 17 showing the CPU-ID functions in AMD chips.
But if you look closely this page says: "At any frequency above 1667 MHz, the model number should be omitted from the name string."
The name string is or will be extended to 48 characters, and this piece of alphabet soup is recognised by the BIOS.