16GB (4x4GB) DDR3-1866 ECC Unbuffered RAM
HP E2S43AV, 16 GB, 4 x 4 GB, DDR3, 1866 MHz, 240-pin DIMM
HP E2S43AV. Component for: PC/Server, Internal memory: 16 GB, Memory layout (modules x size): 4 x 4 GB, Internal memory type: DDR3, Memory clock speed: 1866 MHz, Memory form factor: 240-pin DIMM, ECC