page_title: Cyrix 6x86
section_title: 6x86MX / MII
hierarchical_section_title: Cyrix 6x86 / Models / 6x86MX / MII
caption_attribution_description: English: IBM PR 300 processor
context_page_description: The Cyrix 6x86 is a sixth-generation, 32-bit x86 microprocessor designed by Cyrix and manufactured by IBM and SGS-Thomson. It was originally released in 1996.
context_section_description: Another release of the 6x86, the 6x86MX, added MMX compatibility along with the EMMI instruction set, improved compatibility with the Pentium and Pentium Pro by adding a Time Stamp Counter and CMOVcc instructions respectively, and quadrupled the primary cache size to 64 KB. The 256-byte instruction line cache can be turned into a scratchpad cache to provide support for multimedia operations. Later revisions of this chip were renamed  MII, to better compete with the Pentium II processor. Unfortunately, 6x86MX / MII was late to market, and couldn't scale well in clock speed with the manufacturing processes used at the time.
caption: IBM 6x86MX PR300 processor
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