HyperX 512MB 800MHz DDR2 Non-ECC Ultra Low-Latency DIMM, 0.5 GB, DDR2, 800 MHz, 240-pin DIMM HyperX 512MB 800MHz DDR2 Non-ECC Ultra Low-Latency DIMM. Internal memory: 0.5 GB, Internal memory type: DDR2, Memory clock speed: 800 MHz, Memory form factor: 240-pin DIMM, CAS latency: 3