CODEWITHSUNDEEP
x86cpuid
JohnPS
JohnPS

Reputation: 2626

Which x86 CPUID return values cannot be changed on a processor?

I know that the Name String on some AMD processors can be changed to return a different string. I believe the BIOS can disable cache or SSE support which would necessitate that the bits that indicate cache/SSE support would have to return different values.

Which values returned by the CPUID instruction are guaranteed to never change on a given CPU?

Upvotes: 2

Views: 397

Answers (1)

Necrolis
Necrolis

Reputation: 26171

Thats incredibly generic, as CPU's tend to change over time and they differ between brands, you are better off using the CPUID manuals/specs from AMD and Intel, supplemented with the data from their respective developer manuals.

You'll probably find that the model and family related stuff is constant, along with a lot of the topological features.

Upvotes: 1

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