This product is either discontinued or we cannot get that from suppliers.
Kingston KVR26S19S6/8, 8GB, Speed 2666MHz (PC4-21300), Non-ECC, SODIMM, CAS Latency 19, DDR4, 1R (Single Rank), 260 Pin.
This document describes ValueRAM's KVR26S19S6/8 as a 1G x 64-bit (8GB) DDR4-2666 CL19 SDRAM (Synchronous DRAM), 1Rx16, memory module, based on four 1G x 16-bit FBGA components.