Memory module is a broad term used to refer to a series of dynamic random access memory integrated circuits modules mounted on a printed circuit board and designed for use in personal computers, workstations and servers.
It can be used to these specific types of memory module:
Dual in-line package memory
TransFlash Memory Module
SIPP memory, single in-line pin package memory
SIMM, a single in-line memory module
DIMM, dual in-line memory module
Rambus memory modules are a subset of DIMMs, but are usually referred to as RIMMs
SO-DIMM, small outline DIMM, a smaller version of the DIMM, used in laptops
Overclocking memory is engineered for speed. Extreme Performance DDR2, and DDR3 DIMMs support high frequencies and low latencies for optimum performance.