1GB 333MHz DDR ECC Registered CL2.5 DIMM Dual Rank, x8...Standard 128M X 72 ECC 333MHz 184-pin Registered DIMM (SDRAM-DDR, 2.5V, CL2.5, Double-Sided, Gold). ValueRAM 128M x 72-bit 1GB (1024MB) DDR333 CL2.5 SDRAM (Synchronous DRAM) "dual rank" Registered ECC memory module. The components on this module include eighteen 64M x 8-bit (16M x 8-Bit x 4 bank) DDR333 SDRAM in TSOP packages. This 184-pin DIMM uses gold contact fingers and requires .5V.