Elitegroup Computer Systems (or ECS) is a Taiwan-base electronics firm. It is the fourth largest PC motherboard manufacturer in the world (after Asus, Gigabyte Technology, and MSI), with production reaching 24 million units in 2002. Many of these motherboards have been produced for OEM customers and are used in systems assembled and sold by such brand-name companies as IBM and Compaq. Its main competitor used to be Micro-Star International.