This product is either discontinued or we cannot get that from suppliers.
Qnap RAM8GDR4ECK0RD2666, 8GB, DDR4 SDRAM, Speed 2666 MHz, DDR4-2666/PC4-21300, ECC, Registered, 288-pin, FF DIMM.
These memory modules were designed and manufactured to ensure maximum performances in high end systems. Delivers superior quality, performance, and maximum.