IBM 6x86MX 处理器属于第五代 x86 处理器，于 1997 年 5 月 30 日推出。 这些超标量和超流水线微处理器是 6x86 处理器的继任者，已获得与 MMX 兼容的多媒体扩展。

The Cyrix 6x86 is a line of sixth-generation, 32-bit x86 microprocessors designed and released by Cyrix in 1995. Cyrix, being a fabless company, had the chips manufactured by IBM and SGS-Thomson. [1][2] The 6x86 was made as a direct competitor to Intel's Pentium microprocessor line, and was pin compatible.

1997年，Cyrix发布了核心代号为M2的「6x86MX」，与前面的6x86最大的区别是内置了 MMX指令集。频率从133MHz（PR166）到233MHz（PR266）。最终版本发行时间为1998年2月。Cyrix是无晶圆厂芯片设计公司，制造交由三家完成，分别为IBM、SGS汤姆逊（现意法半导体）、美国国家半导体（NS）, 制程的改进导致初版到最终版相隔一年。 6x86MX进一步将频率提升至300MHz（PR433），同时更名为「Cyrix MII」，以表示竞争对手为Pentium II。 但由于推出 …

1997年4月8日 · Using the Shuttle HOT-569 as a test bed, we see that the Cyrix 6x86MX is a quite competitive processor, at 166MHz it provides business application performance on par with an AMD K6 running at...

The 6x86MX is an evolutionary step from the 6x86 and is very similar to it in internal function. The 6x86MX supports the MMX extension and also features several other improvements over the original 6x86 chip.

6x86mx是6x86加入了对mmx指令集支持后的升级产品，后来6x86mx更名为mii（m2）。 Cyrix 是无厂半导体公司，94年开始他们的处理器由IBM进行流片制造。 双方在合同中约定IBM可以将生产的6x86打上自己的商标出售，所以你这张照片上的6x86用的是IBM的商标。

The Cyrix 6x86 (codename M1) is a sixth-generation, 32-bit x86-compatible microprocessor designed by Cyrix and manufactured by IBM and SGS-Thomson. It was originally released in 1996. The 6x86 is superscalar and superpipelined and performs register renaming, speculative execution, out-of-order execution, and data dependency removal.

接下来，1997年，Cyrix发布了核心代号为M2的「 6x86MX 」，与前面的6x86最大的区别是内置了MMX指令集。频率从133MHz（PR166）到233MHz（PR266）。最终版本发行时间为1998年2月。

i have IBM 6x86MX-AVAPR166GA (66MHz 2.9V)

6x86MX processor design quadruples the cache size, triples the TLB size, increases the frequency scalability to 200 MHz and beyond, and is compat-ible with MMX™ technology. The IBM 6x86MX CPU contains a scratchpad RAM feature, supports perfor-mance monitoring, and allows catching of both SMI code and SMI data. The IBM 6x86MX CPU delivers