G.Skill 4GB (1 x 4GB) PC4-17000 2133MHz DDR4 RAM - 15-15-15-35 - Value Series
Patriot 4GB (1 x 4GB) PC4-21300 2666MHz DDR4 RAM - 19-19-19-43 - Signature Line Series
QNAP RAM-4GDR4T0-SO-2666 4GB DDR4-2666, SO-DIMM, 260 PIN, T0 VERSION
QNAP Systems 4GB DDR4 RAM, 2400 MHZ, UDIMM FOR TS-873U,873U-RP,TS-1273U,1273U-RP,TS-1673U,1673U-RP
QNAP Systems 4GB DDR4-2133MHz Long-DIMM RAM - Module 288 PIN TVS-x82T, TVS-x82
QNAP Systems 4GB 2400MHz DDR4 UDIMM RAM
QNAP Systems 4GB 2666MHz DDR4 RAM
Synology 4GB (1x4GB) DDR4 UDIMM 2133MHz RAM Module for RS2418(RP)+, RS2818RP+
Synology 4GB DDR4 non-ECC Unbuffered DIMM
Synology D4EU01-4G 4GB DDR4 ECC Unbuffered DIMM - for RS2821RP+, RS2421RP+, RS2421+
Synology D4ES04-4G 4GB (1 x 4GB) DDR4 ECC Unbuffered SODIMM, 260 Pin