144 Pin SODIMM

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A small outline dual inline memory module (SODIMM) consists of a number of memory components (usually black) that are attached to a printed circuit board (usually green). SODIMMs get their name because they are smaller and thinner than regular DIMMs. The gold or tin pins on the bottom of the SODIMM provide a connection between the module and a socket on a larger printed circuit board. The pins on the front and back of a SODIMM are not connected, providing two lines of communication paths between the module and the system.

144-pin SODIMMs are commonly found in laptop computers. Each 144-pin SODIMM provides a 64-bit data path, so they are installed singly in 64-bit systems. 144-pin SODIMMs are available in EDO, 66MHz SDRAM, PC100 SDRAM, and PC133 SDRAM. When upgrading, be sure to match the memory technology that is already in your system.

The number of black components on a 144-pin SODIMM may vary, but they always have 72 pins on the front and 72 pins on the back for a total of 144. 144-pin SODIMMs are approximately 2.625" long and 1" high, though the heights may vary. They have one small notch within the row of pins along the bottom of the module.

A type of memory commonly used in notebook computers is called SO DIMM or Small Outline DIMM. The principal difference between a SO DIMM and a DIMM is that the SO DIMM, because it is intended for use in notebook computers, is significantly smaller than the standard DIMM. The 72-pin SO DIMM is 32 bits wide and the 144-pin SO DIMM is 64 bits wide.

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.