No the system memory is not including video memory as the other poster has said but system memory can be used by the os when there's more video ram is required. For example when you got a 1gb card but the game is asking for 1.5gb then the system memory namely the dimms will step in to action by os. If you got 2gb that's considered enough video ram for a graphics card @1080p so you don't/won't need system memory. Also 4gb or more system memory requires a 64bit windows. Thank you.