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Cyrix MXi - 233 MHz / 66 MHz Bus 3.5x / 2.5V r2.1 ES Here is another extremely rare engineering sample of the second stepping of the never-released Cyrix MXi. This chip uses the "Cayenne" Core, the succesor of the MediaGX. This chip was planned to support 3DNow! instruction and built in the 0.18 µm process. It is unclear if this CPU is based on the "Gobi" spinoff, which is a standalone version of the real, highly integrated, "Cayenne". It was build in feb 1999