This product is either discontinued or we cannot get that from suppliers.
QNAP RAM4GDR3-SO-1600, 4 GB, Speed PC3-12800 (1600 MHz), DDR3, 204-Pin SO-DIMM.
The 4GB DDR3 -1600 204-Pin SODIMM Memory Module from QNAP is a DDR3-1600 SODIMM memory module. It provides 204-pin interface.