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DIMMsDIMMs (Dual In-line Memory Modules) provide a wider data path than SIMMs (Single In-line Memory Modules). DIMMs are "wider" than SIMMs in the amount of data they can carry.
SIMMsSIMMs are installed in pairs on the original Power Macintosh 6100, 7100, and 8100 series computers. These 72-pin, 80ns or faster SIMMs, have a 32-bit wide internal data path. The data bus is 64-bits wide on these computers. Two SIMMs are required to accommodate this data bus.The Power Macintosh 5200 series computers have a 32-bit wide data bus and can be installed one SIMM at a time. The 5200 series computers have two SIMM slots. Additional memory can be added by filling the other slot with one 72 pin, 70ns or faster SIMM. The Power Macintosh 7200, 7500, 8500, and 9500 series computers use 168-pin, 70ns or faster DIMMs, which are 64-bit wide. It takes one DIMM to meet the 64-bit wide data bus requirement. The Power Macintosh 7500, 8500, and 9500 series computers also support memory interleaving when DIMMs are installed in pairs. The Power Macintosh 7200 series computers do not support memory interleaving and can be installed one DIMM at a time.
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Ever wonder what the difference is between a SIMM and a DIMM? 