512MB 266MHz DDR Non-ECC CL2.5 DIMM...Standard 64M X 64 Non-ECC 266MHz 184-pin Unbuffered DIMM (SDRAM-DDR, 2.5V, CL2.5, Gold). ValueRAM's 64M x 64-bit (512MB) DDR266 CL2.5 SDRAM (Synchronous DRAM) memory module. The components on this module include sixteen 32M x 8-bit (8M x 8-bit x 4 Bank) DDR266 SDRAM in TSOP packages. This 184-pin DIMM uses gold contact fingers and requires +2.5V.