You can play several Call of Duty games on a 4GB RAM PC without a dedicated graphics card. Some of the older titles such as Call of Duty 4: Modern Warfare, Call of Duty: World at War, and Call of Duty: Modern Warfare 2 may run on your system.

Many modern games come with a variety of graphics settings that allow you to tailor the experience to your hardware. Lowering the in-game graphics settings, such as resolution, texture quality, shadows, and effects, can significantly improve performance on a system without a dedicated graphics card.