This product is either discontinued or we cannot get that from suppliers.
Kingston KVR29N21S8/16BK DIMM Memory, Capacity 16 GB, DDR4 SDRAM - DIMM 288-pin, Non-ECC, Speed 2933 MHz (PC4-23400), Latency Timings 21, Single rank, unbuffered, Voltage 1.2.
KVR29N21S8/16BK Kingston 16GB DDR4 Non ECC PC4-23400 2933MHz Memory.