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The memory modules can be divided into three main categories. The first category is the SIMM memory modules. SIMM stands for single in-line memory module. Using SIMM memory modules means that someone would usually have to install more two modules in order to reach a decent amount of memory for their computer. The SIMM vary from a 30-pin connection to a 72-pin connection capable of 256 megabytes of RAM.
The second category of memory modules is the DIMM or dual inline memory modules. These are larger in size with 144 and 168 pin connectors, and can be installed as a single unit to receive the amount of memory needed. DIMM memory modules can provide up to 1 gigabyte of memory.
The third category of memory modules is the SOIMM or small outline dual inline. These are smaller than the regular DIMMs, and are used on Macintosh computers.