QNAP 4GB DDR4 RAM 2400MHz SO-DIMM Memory Module - PC4-19200, Non-ECC, 1.2V
at eBay
QNAP TS-233-US 2 Bay Affordable Desktop NAS with ARM Cortex-A55 Quad-core Processor and 2 GB DDR4 RAM (Diskless)
at Amazon Marketplace
QNAP TS-410E-8G-US 4 Bay Professional fanless Desktop NAS with Intel Celeron Quad-core Processor, 8 GB DDR4 RAM and Dual 2.5GbE (2.5G/1G/100M) Network Connectivity (Diskless)
QNAP TS-855eU-RP-8G-US 8 Bay High-Speed 2U Short-Depth rackmount NAS with Dual-2.5GbE, Intel Atom CPU, Redundant 300W PSU, 8GB DDR4 Memory and 8-core Computing Power (Diskless)
QNAP TS-H1090FU-7302P-128G 10-Bay Rack TS-H1090FU-7302P-128G 10-Bay Rack Mount NAS AMD EPYC 7302P 16-Core 3.3GHz 8x16GB RDIMM DDR4 ECC
QNAP TS-253E-8G-US 2 Bay Desktop NAS | Intel Celeron Quad-Core Processor, 8 GB DDR4 RAM, Dual 2.5GbE Network Connectivity, Diskless
QNAP TS-433-4G-US 4 Bay NAS with Quad-core Processor, 4 GB DDR4 RAM and 2.5GbE Network (Diskless)
at Amazon.co.uk
PHS-memory 64 GB RAM Memory Module for QNAP TDS-16489U-SF2-R2 DDR4 LRDIMM 2666MHz PC4-2666V-L