edit: I am not sure about this but your memory might also be too slow / too fast for the accelerator.
Faster RAM shouldn't be the problem. If the system needs at least 60ns SIMMs and you put 50ns SIMMs, you shouldn't see a problem since 50ns is faster than 60ns. Don't put 70ns SIMMs were 60ns SIMMs are required, though. It's been awhile since I played with SIMMs but I seem to remember issues with putting EDO RAM into systems that don't support EDO.
PC133 can be an exception to the speed rating. Certain manufacturers PC133 DIMMs simply won't work in PC100 systems. This is most likely caused by bus impedance issues or a designed-in limitation but, the company I was dealing with wasn't answering questions.
