Call of Duty Forum offers minimum system specifications for Call of Duty: Black Ops 2, revealing the upcoming first-person shooter sequel will not support Windows XP (thanks Destructoid/GameSpy). Word is: "Since we upgraded the engine to use DirectX11, Windows XP is no longer supported. It requires Windows Vista or later." They also outline PC-specific enhancements: "Black Ops II PC features enhanced lighting, shadows, antialiasing, bloom, depth of field, ambient occlusion, and other enhanced effects that are still in the works. And the game can run at higher resolutions and higher framerates on the PC." Here are the specifications:

OS: Windows Vista SP2 or Windows 7
CPU: Intel Core2 Duo E8200 2.66 GHz or AMD Phenom X3 8750 2.4 GHz
Memory: 2GB for 32-bit OS or 4GB for 64-bit OS
Video Card: Nvidia GeForce 8800GT 512 MB or ATI Radeon HD 3870 512 MB