72 Pin SIMM

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A single inline memory module (SIMM) consists of a number of memory components (usually black) that are attached to a printed circuit board (usually green). The gold or tin pins on the bottom of the SIMM provide a connection between the module and a socket on a larger printed circuit board. The pins on the front and back of a SIMM are connected, providing a single line of communication paths between the module and the system.

72-pin SIMMs are commonly found in older desktop computers, such as the 486 and early Pentium models. Each 72-pin SIMM provides a 32-bit data path, so they can be installed singly in 32-bit systems (486 models) but must be installed in pairs in 64-bit systems (Pentium and Athlon models). 72-pin SIMMs are available in FPM or EDO. When upgrading, be sure to match the memory technology that is already in your system.

The number of black components on a 72-pin SIMM may vary, but they always have exactly 72 pins. 72-pin SIMMs are approximately 4.25" long and 1" high, though the heights may vary. They have one notch on the bottom left and one notch in the center of the module.

FAST PAGE MODE (FPM)

At one time, FPM was the most common form of DRAM found in computers. In fact, it was so common that people simply called it "DRAM," leaving off the "FPM". FPM offered an advantage over earlier memory technologies because it enabled faster access to data located within the same row.

EXTENDED DATA OUT (EDO)

In 1995, EDO became the next memory innovation. It was similar to FPM, but with a slight modification that allowed consecutive memory accesses to occur much faster. This meant the memory controller could save time by cutting out a few steps in the addressing process. EDO enabled the CPU to access memory 10 to 15% faster than with FPM.