This product is either discontinued or we cannot get that from suppliers.
Qnap RAM-2GDR3L-SO DDR3L RAM, Interface 204-Pin SO-DIMM, Memory 2 GB, Speed 1600 MHz, Compatibility TS-x51, 451U, x53, x53U, TVS-x63 Series.
The QNAP RAM-2GDR3L-SO is a DDR3L SO-DIMM RAM Memory which is used for upgrading NAS storage. The QNAP RAM-2GDR3L-SO memory provides 2GB Memory with DDR3L SO-DIMM RAM 1600 MHz.