Mandrew wrote on 2023-07-12, 08:14:
Thanks, so I don't need the somewhat overpriced version without the P120+ label for simple test reasons. That's a relief.
Cyrix soft launched the 6x86 in 1995, I remember considering one late that year.
(Pr90) but instead got a retail branded AST ADVENTURE ADVANTAGE 4/66D (less expensive)
The very first 6x86 chips were rated by clock speed only. 80 or 100 mhz
The PR values came later
This is similar to the AMD 486DX5-133 I had, apparently very early before it got relabeled into the 5x86
I had a motherboard with a 40, 45, and 55mhz FSB, it listed support for Cyrix PR90/100/120/133/150
Oddly 45mhz x 2x for PR100 I can’t say I’ve ever seen before.
My guess is they never released that speed grade but it made it into the manual for a few motherboard’s.