[Pre Order - allow extra time] QNAP 16GB DDR4 2666 MHz SO-DIMM Memory Module For the QNAP TVS-472XT & TVS-672XT, For the QNAP TVS-872XT, 16GB (1 x 16GB) Capacity, 2666 MHz Clock Speed, PC4-21300, 260-Pin SO-DIMM, 1.2V, Unbuffered, Non-ECC