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Mixing DRAM Speeds
Mixing memory speeds refers to the use of DRAM of more than one speed in the same computer. For example, you might have bought a machine in 1994 that came with 70 ns DRAM (the fastest speed generally available then) and later upgraded with more memory in 1997 that was 60 ns. While it's generally preferable to avoid doing this, it can work without problems as long as certain caveats are followed:
Some systems just generally have a hard time working with dissimilar banks of memory. I once tried to upgrade a system that had a pair of 8 MB, fast page mode 60 ns SIMMs, with another pair of 8 MB, fast page mode 60 ns SIMMs of another brand. The two pairs just would not work together in any configuration, even though they worked fine separately. See this section of the Troubleshooting Expert for more on RAM problems.