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http://www.amd.com/us-en/assets/content_type/white_papers_and_tech_docs/20734.pdf
のTable37にのってました。
以下抜粋。
00h: AMD Engineering Sample NN
01h: AMD Athlon(tm) 64 Processor XX00+
02h: Mobile AMD Athlon(tm) 64 Processor XX00+
03h: AMD Opteron(tm) Processor 1YY
04h: AMD Opteron(tm) Processor 2YY
05h: AMD Opteron(tm) Processor 8YY
06h-08h: Reserved
09h: AMD Athlon(tm) 64 FX-ZZ Processor
0Ah-0Fh: Reserved
Notes: For more information, see "8-Bit Brand ID" on page 54 and "EBX--12-Bit Brand ID" on page 61.
NN=two digit decimal equivalent of bits 4-0.
XX=22+NN. For example, 00001b stands for "23", 11111b stands for "53", and 01001101b stands for "99".
YY=38+2*NN. For example, 00001b stands for "40" and 11110b stands for "98". Encoding 11111b is reserved.
ZZ=24+NN. For example, 00011011b stands for "51" and 00100011b stands for "59".
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