HyperX KHX6400D2B1/1G, 1 GB, 1 x 1 GB, DDR2, 800 MHz, 240-pin DIMM HyperX KHX6400D2B1/1G. Internal memory: 1 GB, Memory layout (modules x size): 1 x 1 GB, Internal memory type: DDR2, Memory clock speed: 800 MHz, Memory form factor: 240-pin DIMM, CAS latency: 5