4GB (8x512MB), DDR2 400MHz, ECC, Registered
HP 4GB DDR2-400, 4 GB, DDR, 400 MHz, 184-pin DIMM
HP 4GB DDR2-400. Component for: PC/Server, Internal memory: 4 GB, Internal memory type: DDR, Memory clock speed: 400 MHz, Memory form factor: 184-pin DIMM, CAS latency: 3, ECC