In the x86 architecture, the CPUID instruction (identified by a CPUID opcode) is a processor supplementary instruction (its name derived from See more

The CPUID opcode is 0F A2.
In assembly language, the CPUID instruction takes no parameters as CPUID implicitly uses the … See more

Some of the non-x86 CPU architectures also provide certain forms of structured information about the processor's abilities, commonly as a set of … See more

• "AMD64 Technology Indirect Branch Control Extension" (PDF) (White paper). Revision 4.10.18. Advanced Micro Devices, Inc. (AMD). 2018. Archived (PDF) from the original on 2018-05-09. Retrieved 2018-05-09. See more

Prior to the general availability of the CPUID instruction, programmers would write esoteric machine code which exploited minor differences in CPU behavior in order to determine the processor make and model. With the introduction of the … See more

Inline assembly
This information is easy to access from other languages as well. For instance, the C code for gcc … See more

• CPU-Z, a Windows utility that uses CPUID to identify various system settings
• CPU-X, an alternative of CPU-Z for Linux and FreeBSD See more