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CPU ID
CPUID instruction was introduced by Intel in Pentium processor. Since then it became the official method of
identification for Pentium class and newer chips. It is also supported by newer 486-class chips made by Intel,
AMD, UMC and Cyrix, and newer NexGen CPUs. Some CPUs may require CPUID to be enabled. In addition it is best
to use the CPUID command on a plain system because some chips have a programmable CPUID register.
vendor string
| AuthenticAMD |
AMD |
| AMD IS BETTER |
AMD engineering |
| DEI |
AMD |
| NexGenerationAMD |
AMD K6 |
| CyrixInstead |
Cyrix / IBM |
| Geode by NSC |
National Semiconductor |
| NexGenDriven |
NexGen |
| GenuineIntel |
intel |
| CentaurHauls |
IDT / Centaur |
| RiseRiseRise |
Rise Technology |
| SiS SiS SiS |
SiS |
| GenuineTMx86 |
Transmeta |
| UMC UMC UMC |
UMC |
CPU type
| 11 |
reserved |
| 10 |
secondary CPU |
| 01 |
overdrive CPU |
| 00 |
primary CPU |
CPU family
| 4 |
80486 and compatible |
| AMD 5x86 |
| Cyrix 5x86 |
| 5 |
intel Pentium |
| Transmeta Crusoe TM3x00 / TM5x00 |
| NexGen Nx586 |
| NatSemi Geode |
| Cyrix M1, MediaGX |
| AMD K5, K6 |
| IDT C6, WinChip2, WinChip3 |
| SiS 55x |
| Rise mP6 |
| 6 |
intel Pentium Pro, Pentium II/III/M, Celeron |
| AMD K7 Athlon, Duron |
| Cyrix M2, IBM MII |
| VIA C3 |
| 7 |
intel Itanium, Itanium II |
| 15 |
intel Pentium 4 |
| AMD Opteron / Athlon64 |
CPUID on mainframe processors
Every IBM or Plug Compatible Mainframe processor (Hitachi, Amdahl, etc ....) has a fixed format unique CPUID assigned
to it during manufacture. The CPUID of all installed processors can be easily obtained by entering the MVS command
D M=CPU
at a console attached to the MVS system where XPFC is to run. It has the following format:
ABCDEFGHJK
A - CPU number
B - Partition ID
CDEF - Serial number (CPUID)
GHJK - Processor model
| 3080 |
IBM |
| 3083 |
IBM |
| 3090 |
IBM |
| 9021 |
IBM |
| 5890 |
Amdahl |
| 5995 |
Amdahl |
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