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SIMM and DIMM refer not to memory types, but to modules (circuit boards plus chips) in which RAM is packaged. SIMMs, the older of the two, offer a data path of 32 bits. Because Pentiums are designed to handle a much wider data path than that, SIMMs must be used in pairs on Pentium motherboards (they can be used singly on boards based on 486 or slower processors). DIMMs, which are of more recent origin, offer a 64-bit path, which makes them more suitable for use with the Pentium and other more recent processors. From a buyer's standpoint, the good news is that one DIMM will handle the work of two SIMMs and thus can be used singly on a Pentium motherboard. DIMMs are more economical in the long run, because you can add one at a time to your system.

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Published as Tutor in the 10/21/97 issue of PC Magazine.