This product is either discontinued or we cannot get that from suppliers.
Lenovo Thinksystem 7X77A01303, RAM Module, 1.20 V, Standrd DDR4-2666/PC4-21300, DDR4 SDRAM, CL17, 16 GB, FF DIMM, Speed 2666 MHz, ECC, 288-pin.
ThinkSystem 16GB TruDDR4 2666 MHz (2Rx8 1.2V) RDIMM.