Hikvision 4GB DDR4 2666 UDIMM – U1(STD) Desktop Memory – Single Rank DDR4 SDRAM, 2666 MT/S (PC4-21300), 2,666 MHz, CL19 latency, VOLTAGE 1.2V, PIN COUNT-288-pin, Buffered DIMM Desktop SDRAM, Compatible with systems that take DDR4 2666MT/s UDIMM memory. Speeds up to 3200 MT/s and faster data rates are expected to be available as DDR4 technology matures, Increase bandwidth by up to 32 percent, Reduce Power consumption by up to 40 percent