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While an integrated memory controller has the potential to increase the system's performance, such as by reducing [[memory latency]], it locks the microprocessor to a specific type (or types) of memory, forcing a redesign in order to support newer memory technologies. When [[DDR2 SDRAM]] was introduced, AMD released new [[Athlon 64]] CPUs. These new models, with a DDR2 controller, use a different physical socket (known as [[Socket AM2]]), so that they will only fit in motherboards designed for the new type of RAM. When the memory controller is not on-die, the same CPU may be installed on a new motherboard, with an updated northbridge to use newer memory.
Some microprocessors in the 1990s, such as the DEC [[Alpha 21066]] and HP [[PA-7300LC]], had integrated memory controllers; however, rather than for performance gains, this was implemented to reduce the cost of systems by eliminating the need for an external memory controller.{{cn|reason=The linked articles do mention a cost motivator but there are no supporting citations.|date=July 2024}}
Some CPUs are designed to have their memory controllers as dedicated external components that are not part of the chipset. An example is IBM [[POWER8]], which uses external [[Centaur (computing)|Centaur]] chips that are mounted onto [[DIMM]] modules and act as memory buffers, [[L4 cache]] chips, and as the actual memory controllers. The first version of the Centaur chip used DDR3 memory but an updated version was later released which can use DDR4.<ref>{{cite web|url=https://www.itjungle.com/2016/10/17/tfh101716-story02/|title=IBM Brings DDR4 Memory To Bear On Power Systems|last=Prickett Morgan|first=Timothy|date=2016-10-17|website=IT Jungle|pages=1|access-date=2017-09-07}}</ref><!--[[User:Kvng/RTH]]-->
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