1GB 266MHz DDR Non-ECC CL2 DIMM...Standard 128M X 64 Non-ECC 266MHz 184-pin Unbuffered DIMM (SDRAM-DDR, 2.5V, CL2, Gold). ValueRAM's 128M x 64-bit 1GB (1024MB) DDR266 CL2 SDRAM (Synchronous DRAM) memory module. The components on this module include sixteen 64M x 8-bit (16M x 8-bit x 4 Bank ) DDR266 SDRAM in TSOP packages. This 184-pin DIMM uses gold contact fingers and requires .5V.