10 Facts About Cyrix 6x86

Cyrix 6x86 is a line of sixth-generation, 32-bit x86 microprocessors designed and released by Cyrix in 1995.

Cyrix 6x86, being a fabless company, had the chips manufactured by IBM and SGS-Thomson.

The Cyrix 6x86 was made as a direct competitor to Intel's Pentium microprocessor line, and was pin compatible.

In mid February 1996 Cyrix announced the P166+, P150+, and P133+ to be added to the 6x86 model line.

Cyrix 6x86 P200+ was planned for the end of 1996, and ended up being released in June.

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Later by the end of May 1997 on the 27th, Cyrix said they would announce details of the new chip line the day before Computex in June 1997.

Cyrix 6x86 hoped to ship tens of thousands within June 1997 with up to 1 million by the end of the year.

Cyrix 6x86 is superscalar and superpipelined and performs register renaming, speculative execution, out-of-order execution, and data dependency removal.

The Cyrix 6x86 is socket-compatible with the Intel P54C Pentium, and was offered in six performance levels: PR 90+, PR 120+, PR 133+, PR 150+, PR 166+ and PR 200+.

Similarly to AMD with their K5 and early K6 processors, Cyrix used a PR rating to relate their performance to the Intel P5 Pentium, as the 6x86's higher per-clock performance relative to a P5 Pentium could be quantified against a higher-clocked Pentium part.