Lenovo 46W0688. Component for: PC/Server, Internal memory: 4 GB, Memory layout (modules x size): 1 x 4 GB, Internal memory type: DDR3, Memory clock speed: 1866 MHz, Memory form factor: 240-pin DIMM, CAS latency: 13, ECCUpgrading your memory is a cost-effective way to improve system performance when insufficient memory and hard drive paging is slowing your applications down.– Faster start-up times with fewer delays during routine operations.– More programs running simultaneously.– Easy toggling between several open applications.– Rigorous supplier qualification processes for ensured quality.