My evelotion @ OSs / Mhz 3.1 --> 95 --> ME --> XP 386/486 --> 66mhz --> 133mhz --> 550mhz --> 2533mhz To your information, they reason why I ME is because I, at the time, only had the choice between 98Se and ME ... I still regret buying it, cause it really "beeeeeeep"!