184 Pin DDR SDRAM Dimms 184 Pin DDR Dimms are designed for the latest desktops and servers. Each 184 Pin Dimm provides a 64-bit data path, so they can be installed singly in 64-bit systems. To use DDR memory, your system motherboard must have 184-pin DIMM slots and a DDR-enabled chipset. DDR SDRAM (Double Data Rate-Synchronous DRAM) is a type of SDRAM that supports data transfers on both edges of each clock cycle, effectively doubling the memory chip's data throughput. Xpert Systems offers PC-266 (PC2100), PC-333 (PC2700) & the latest PC-400 (PC3200) compliant modules.