X86-Secret : ES Zone
6x86MX-PR266 ES  (Week 07, Year 1998)   
6x86MX-PR266 / 83 MHz Bus 2.5x 2.9V / ES

Codenamed MII, the Cyrix 6x86MX was introduced on May 30th 1997 with three differents models : PR166, PR200 and PR233. This engineering sample is a pre-production prototype of the PR266 model, released on February '98. It uses a front side bus of 83 MHz and a multiplier of 2.5X for a real frequency of 208 MHz.