4GB (4x1GB), DDR 400MHz, ECC, Registered
HP 4GB DDR-400, 4 GB, 4 x 1 GB, DDR, 400 MHz, 240-pin DIMM
HP 4GB DDR-400. Component for: PC/Server, Internal memory: 4 GB, Memory layout (modules x size): 4 x 1 GB, Internal memory type: DDR, Memory speed: 400 MHz, Memory form factor: 240-pin DIMM, CAS latency: 3, ECC