This product is either discontinued or we cannot get that from suppliers.
Qnap RAM4GDR4K0SO2666 RAM Module, Memory 4 GB, DDR4 SDRAM, Memory Voltage 1.20 V, Speed 2666 MHz, DDR4-2666/PC4-21333, Non-ECC, Device NAS Server, Number of Pins-260, Form Factor SoDIMM.
These memory modules were designed and manufactured to ensure maximum performances in high end systems. Delivers superior quality, performance, and maximum compatibility with the computing systems.