Has Cyrix made changes to the 6x86MX PR rating since its initial release?
A. Yes, Cyrix has made modifications to the original 6x86MX PR rating that was implemented with the introduction of the 6x86MX on May 30, 1997. Cyrix is planning on adding parts at other clock frequencies and multipliers, but most of the initial clock frequencies and multipliers will be also shipped. As of July 24, 1997, the Cyrix 6x86MX PR166 is now a 133MHz (66MHz x 2) instead of a 150MHz (60MHz x 2.5) as originally introduced. There is also now a 6x86MX PR200 at 150MHz (75MHz x 2) in addition to the PR200 at 166MHz (66MHz x 2.5). The purpose of the rerating is to increase the availability of higher speed parts and not to mask any problems with the chip. Basically, Cyrix was having to throw away a lot of perfectly good 133MHz parts that they could be selling as PR166s if they would sell them at 133MHz and clock double a 66MHz bus. My own benchmarks prove that this is valid. Cyrix could also call a 150MHz 6x86MX a PR200 instead of a PR166 if they clock doubled a 75MHz bus. The end res
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