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The '''memory controller''' is a chip on a computer's [[motherboard]] which manages the flow of data going to and from the [[random access memory|memory]].
Modern [[microprocessors]], such as [[AMD]]'s Athlon 64, FX, and [[Opteron]], [[IBM]]'s [[POWER5]], and [[Sun Microsystems]] UltraSPARC IV, [[UltraSPARC IV+]], [[UltraSPARC T1]] have a memory controller on the CPU die to reduce the [[memory latency]].
Some memory controllers are 128-bit.
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