Memory,  QNAP, 

16GB DDR4 RAM 2400 MHZ UDIMM .

QNAP RAM Module - 16 GB (1 x 16GB) - DDR4-2400/PC4-19200 DDR4 SDRAM - 2400 MHz - CL17 - 1.20 V

QNAP RAM Module - 16 GB (1 x 16GB) - DDR4-2400/PC4-19200 DDR4 SDRAM - 2400 MHz - CL17 - 1.20 V - Non-ECC - Unbuffered - 288-pin - DIMM

8GB DDR3 RAM 1600 MHZ LONG-DIMM

QNAP RAM Module for Server - 8 GB (1 x 8GB) DDR3 SDRAM - 1600 MHz

QNAP RAM Module for Server - 8 GB (1 x 8GB) DDR3 SDRAM - 1600 MHz - DIMM

QNAP 4GB DDR4 RAM 2400 MHZ UDIMM

QNAP RAM Module - 4 GB (1 x 4GB) - DDR4-2400/PC4-19200 DDR4 SDRAM - 2400 MHz - CL17 - 1.20 V

QNAP RAM Module - 4 GB (1 x 4GB) - DDR4-2400/PC4-19200 DDR4 SDRAM - 2400 MHz - CL17 - 1.20 V - Non-ECC - Unbuffered - 288-pin - DIMM

4GB DDR3L RAM 1600 MHZ SO-DIMM

4GB DDR3L RAM Module:

QNAP - SODIMM 8GB DDR4-2666/PC4-21333 2666 MHZ - 260-PIN

QNAP RAM Module - 8 GB - DDR4-2666/PC4-21333 DDR4 SDRAM - 2666 MHz

QNAP RAM Module - 8 GB - DDR4-2666/PC4-21333 DDR4 SDRAM - 2666 MHz - 260-pin - SoDIMM