Single In Line Memory Module - 72 pins

SIMM-72 is a 32-bit memory module using 72 terminals. It normally uses FPM (Fast Page Mode) or EDO (Extended Data Out) memory chips. EDO chips offer a higher performance than FPM ones.

Since it is a 32-bit module, it must be installed like the following:

• 486 and 5x86: One in one.
• Pentium, equivalents (K5, K6, etc) and higher: Two in two, since the CPU accesses memory at 64 bits.

SIMM-72 modules were gradually replaced by DIMM memory modules, which are 64-bit modules.

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Figure 1: SIMM-72 memory module.

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Figure 2: Motherboard with both SIMM-30 and SIMM-72 sockets.

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