What is PC2100 DDR SDRAM?

DDR (double data rate) SDRAM is the latest evolution in random access memory (RAM) technology. All SDRAM operates on a system frequency or "bus" speed measured in mega hertz (MHz). Traditional SDRAM used only the rising edge of the clock cycle to transfer data.

The new DDR SDRAM transfers data on both the rising and falling edge of the clock. PC2100 is the common name for the JEDEC specification for DDR which runs on a 133MHz bus speed (266MHz double data rate). The chips themselves are named in a more conventional way as "DDR-266" where the name reflects their MHz speed.

The modules, however, are named for the effective data transfer of 2100 MB/sec (2.1 GB/sec) on a 64-bit bus. PC2100 DDR uses DDR-266 chips. PC2100 DDR is designed for use with motherboards supporting the PC2100 spec and above and CPUs which run on a 133MHz FSB (266MHz DDR) and above.

This PC2100 module is an unbuffered 184-Pin Double Data Rate (DDR) Synchronous DRAM Dual In-Line Memory Module (DIMM), organized as a ... more.

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