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Memory Module Identification

These are examples of the most common types of memory modules found in computers.

184-pin DIMM approx. 5.375" x 1" (13.65cm x 2.54cm)

184-pin DIMMs are found in desktop computers (DDR)


184-pin RIMM approx. 5.375" x 1" (13.65cm x 2.54cm)

184-pin RIMMs are found in desktop computers usually installed in pairs (Intel i820/i840 chipsets)

168-pin DIMM approx. 5.375" x 1" (13.65cm x 2.54cm)

168-pin DIMMs are commonly found in Pentium and Athlon systems. (PC100, PC133)

144-pin MICRODIMM approx. 1.545" x 1" (3.92cm x 2.54cm)

144-pin MicroDIMMs are commonly found in sub-notebook computers.

100-pin DIMM approx. 3.5" x 1.25" (8.89cm x 3.175cm)

100-pin DIMMs are commonly found in printers.


200-pin SODIMM approx. 2.625" x 1" (6.67cm x 2.54cm)

200-pin SODIMMs are commonly found in laptop computers (DDR).


144-pin SODIMM approx. 2.625" x 1" (6.67cm x 2.54cm)

144-pin SODIMMs are commonly found in laptop computers (PC100, PC133)


72-pin SODIMM approx. 2.375" x 1" (6.03cm x 2.54cm)

72-pin SODIMMs are commonly found in laptop computers.


72-pin SIMM approx. 4.25" x 1" (10.8cm x 2.54cm)

72-pin SIMMs are commonly found in older desktop computers, such as the 486 and early Pentium models.


30-pin SIMM approx. 3.5" x .75" (8.89cm x 1.91cm)

30-pin SIMMs are commonly found in older desktop computers, such as the 386 and 486 models. All 30-pin SIMMs use FPM memory technology.