On November 8th, COD MW3 will be available on Steam and shops. you can see the requirements:

• OS: Windows® XP/ Windows® Vista / Windows® 7
• Processor: Intel® Core™ 2 Duo E6600 or AMD Phenom™ X3 8750 processor or better
• Memory: 2 GB RAM
• Graphics: Shader 3.0 or better 256 MB NVIDIA® GeForce™ 8600GT / ATI® Radeon™ X1950 or better
• DirectX®: DirectX® 9.0c or later
• Hard Drive: 16 GB free hard drive space
• Sound: DirectX® 9.0c or later
• Internet: Broadband connection and service required for Multiplayer Connectivity. Internet connection required for activation.

New images about COD MW3 reveal