QNAP 4GB DDR3 1600MHz SO-DIMM, Component for Notebook, Internal memory 4 GB, Memory layout (modules x format) 1 x 4 GB, Internal memory type DDR3, Clock speed memory 1600 MHz. Qnap 2GB DDR3 RAM 1600 MHZ SO-DIMM FOR NAS Accessories (RAM-4GDR3T0-SO-1600).