HP 256MB PC133 SDRAM, 0.25 GB, 1 x 0.25 GB, 133 MHz, 168-pin DIMM HP 256MB PC133 SDRAM. Component for: PC/server, Internal memory: 0.25 GB, Memory layout (modules x size): 1 x 0.25 GB, Memory clock speed: 133 MHz, Memory form factor: 168-pin DIMM, ECC