Includes 2 Corsair RAM sticks and Microsoft OS. The Corsair CMX4GX3M1A1333C9 XMS3 4GB DDR3 RAM is part of Corsairâs Desktop line of DDR3 memory. This module allows users to experience outstanding memory performance and stability. Each module is built using carefully selected RAMs. This Corsair CMX4GX3M1A1333C9 XMS3 4GB DDR3 RAM runs at 1333MHz at CAS latency of 9-9-9-24. Increase your computers performance and purchase the Corsair CMX4GX3M1A1333C9 XMS3 4GB DDR3 RAM solution today. With Microsoft Windows 7 Home Premium Operating System Software, you'll get the best entertainment experience on your PC! Windows 7 Home Premium makes it easy to create a home network and share all of your favorite photos, videos, and music. You can even watch, pause, and rewind TV or record it to watch whenever and wherever you want.* For the best entertainment experience on your PC, choose Windows 7 Home Premium.