16GB (8x2GB) DDR2-667 ECC Memory Riser
HP GL644AV, 16 GB, 2 x 8 GB, DDR2, 667 MHz, 240-pin DIMM
HP GL644AV. Component for: PC/Server, Internal memory: 16 GB, Memory layout (modules x size): 2 x 8 GB, Internal memory type: DDR2, Memory clock speed: 667 MHz, Memory form factor: 240-pin DIMM, ECC