Re: "Pentium/TSC" (was Re: CPU options during config)

Aaron Tiensivu (tiensivu@pilot.msu.edu)
Sat, 9 Jan 1999 12:55:14 -0500

> While on this subject, might I suggest that if K5/Cx5x86/Cx6x86 don't
> support RDTSC, perhaps the options might be changed to:
>
> K5/Cx5x86/Cx6x86/other Pentium clones
> Genuine Intel Pentium

As far as I know, these chips get RDTSC right 100% of the time:
Any Intel chip
AMD K6-[123]
AMD K5 [stepping above 0]
IDT WinChip [stepping above 0] and WinChip 2
Later revision Cyrix chips

As far as I know, these chips get RDTSC wrong:
AMD K5 stepping 0
IDT WinChip stepping 0
Early Cyrix 6x86, MediaGX

These chips don't support RDTSC:
AMD 5x86, Cyrix 5x86, any i486

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