RDIMM (registered dual in-line memory module) is dual in-line memory module (DIMM) with improved reliability. The RDIMM uses a hardware register that buffers the control signals (not the application data) to the modules. The buffering adds a clock cycle and uses more power but handles the heavier electrical loads placed on high-speed, high-density memory modules better than the traditional DIMM, or "unbuffered DIMM" (UDIMM).

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