Lenovo 4gb ddr4 2133mhz non ecc udimm memory 4x70k09920 adding more memory increases system performance this lenovo 4gb ddr4 2133mhz non ecc udimm memory are low power high speed operation memory that use ddr4 sdram devices allows you to upgrade your systemrsquos performance and enhance its ability to run more programs simultaneously test proven 100 compatibility listed for supported systems