Memory upgrade for the ts-253be works perfectly. I ordered this memory upgrade from Amazon and it shows the full 16gb ram available on the system and so far works very well and
Details and Specs Released on the QNAP TS-253Be and TS-453Be Fully Featured NAS – NAS Compares
QNAP TS-253BE NAS server casing 2 Bay TS-253BE-2G | Conrad.com
TS-253Be | Hardware Specs | QNAP
Memory RAM Upgrade for QNAP NAS TS-253Be 4GB DDR3 SODIMM | eBay