Improve productivity by working with multiple monitors. The Matrox quad analog upgrade cable allows users to increase their desktop from two to four monitors on certain Matrox M-Series & P-Series graphics cards. Easy upgrade to four analog monitors Installation involves connecting the Matrox quad analog upgrade cable to a compatible Matrox M-Series or P-Series graphics cards & attaching your analog monitor cables to it. Improve productivity by working with four monitors Manage multiple applications & documents across your monitors with ease to get more done.