Kingston 4GB (1 x 4GB) PC3-12800 1600MHz DDR3 Non-ECC RAM, 1.35V
Kingston Technology System Specific Memory 4GB DDR3 1600MHz Module memory module 1 x 4 GB
QNAP Systems 4GB (1x4GB) 1600MHz DDR3 DIMM RAM
Synology 4GB DDR3 1600 RAM Upgrade (DS1515+ DS1815+)
Transcend 4GB DDR3L PC3-1600 DDR3 RAM - CL11 - JetMemory Series