This product is either discontinued or we cannot get that from suppliers.
Qnap Ram Ecc Lr-dimm For T ( Ram64gdr4ecs0lr26 ), 64 GB, DDR4, 2666 MHz, PC / server, 288-pin DIMM, 1.2 V.
The QNAP RAM64GDR4ECS0LR26 is a 64 GB DDR4 2666 MHz LR-DIMM ECC Memory Module that will let you upgrade the overall memory capacity of your compatible NAS.