The QNAP TS-262 gives you one RAM slot alongside 4GB of soldered memory

QNAP splits the difference on the TS-262: 4GB is soldered to the board, but a free DDR4 SO-DIMM slot lets you push total RAM to 16GB. It’s an unusual hybrid approach — half your memory is locked in place, but the upgrade slot gives you meaningful headroom for heavier NAS workloads.