Uh, you mean from 48MB to 128MB? First thing is, it sound like you're using SIMMs. Most Pentium chipsets can only run SIMMS in matched pairs. If you're running a 486, you can't use EDO, you need Fast Page Mode. Pentiums can use either EDO or Fast Page mode, you're not supposed to mix them but my experience says you can as long as you put the FPM in the first slot.
So anyway they have to be the same sized pairs. You can't even mix FPM and Parity because Parity has an extra chip. Wow.
All boards that support 70ns RAM support 60ns or even 50ns as well. That's because all RAM can be slowed. But if you're trying to run EDO on a 486, or mixing Parity with Non-Parity, or running unmatched pairs, or non-pairs, you're not doing it right.
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