This product is either discontinued or we cannot get that from suppliers.
Qnap RAM-4GDR3EC-LD-1 RAM Module, Memory Size 4 GB, DDR3 ECC RAM, Speed 1600 MHz, Device Server, Number of Pins 240, Form Factor DIMM.
The QNAP RAM-4GDR3EC-LD-1600 is a DDR3 LONG-DIMM RAM Memory which is used for upgrading NAS storage. The QNAP RAM-4GDR3EC-LD-1600 memory provides 4GB Memory with DDR3 ECC RAM 1600MHz.