Hypertec 4GB SDRAM DIMM Kit (Legacy), 4 GB, 4 x 1 GB, SDR SDRAM, 133 MHz, 168-pin DIMM Hypertec 4GB SDRAM DIMM Kit (Legacy). Internal memory: 4 GB, Memory layout (modules x size): 4 x 1 GB, Internal memory type: SDR SDRAM, Memory clock speed: 133 MHz, Memory form factor: 168-pin DIMM