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>most dx4/100's, *including* the tp 755cd are clock-tripled on a 33mhz board. >(most other ibm dx4/100's are, much to their own undoing, clock-doubled on a >50mhz board.) "....What is the downside of running 50/100? Having a multiple of cycle time match up with memory access time?...." ~~~~~ the 50/100 would be slightly faster than a 33/100 because everything except the processor works faster, but the problem-- completely unrelated to thinkpads-- is that the dx4/100 was coming off production lines about the same time as vlb architecture, which is system clock dependant, and nobody, but nobody, was making vlb cards for a 50mhz board. they were all 25 or 33mhz. kinda like mca and os/2-- bigger, better, faster, but non-standard, non-compatable. anyway, i'd like to know if anyone finds out about clock speed flexibility in upgrading the 755cd dx4 to a pentium, so's i can weigh the pros & cons for myself. also if anyone knows whether or not the upgrades are p24t's. Michael J. Verne michael_verne@vmedia.com Systems Analyst, Ventana Communications Group http://www.vmedia.com/michaelv/