On his blog over at Irrational Games, Chris Kline has announced the minimum and recommended PC specifications for Bioshock Infinite. These requirements are as follows:
Minimum
- OS: Windows Vista SP2 x86
- CPU: Intel Core 2 Duo 2.4GHz / AMD Athlon X2 2.7GHz
- RAM: 2GB
- HDD free space: 20GB
- GPU: DirectX 10 compatible ATI Radeon HD 3870 / NVIDIA 8800 GT / Intel HD 3000
- GPU Memory: 1GB
- DirectX-compatible sound card
Recommended
- OS: Windows 7 SP1 x64
- CPU: Quad core
- RAM: 4GB
- HDD free space: 30GB
- GPU: DirectX 10 compatible ATI Radeon HD 6950 / NVIDIA GeForce GTX 560
- GPU Memory: 1GB
- DirectX-compatible sound card
In addition, the blog post lists "Steam account required for game activation and installation. Initial installation requires one-time internet connection for Steam authentication and Platform Update For Windows Vista (KB 971644 required on Vista only for DirectX 11); software installations required (included with the game) include Steam Client, Microsoft DirectX Runtime, Microsoft Visual C++ Redistributable 2008 SP1, and Microsoft Visual C++ Redistributable 2010 SP1."
Chris Kline also listed some DirectX 11 features included in the game: "...contact-hardening dynamic shadows, diffusion depth of field, high definition ambient occlusion and optimized antialiasing."
The original post also discussed controls (including support for console controllers), multi-monitor support, and Steam Big Picture Mode support, and is well worth a read.