Minimum:

Supported OS: Windows® XP/Vista Only
Processor: 2GHz Pentium 4 or AMD Athlon (4 3GHz Pentium or AMD Athlon recommended)
Memory: 1 GB (2 GB recommended)
Graphics: 128 MB RAM DirectX® 9-compliant, video card capable of rendering Pixel Shader 2.0 (256 MB RAM recommended) (see supported list*)
DirectX Version: DirectX 9.0c or later (included)
Sound: DirectX 9 -compliant sound card
Network: 128 kbps upstream or faster (512 kbps upstream or faster needed to host online games)
Hard Drive: 6 GB
*Supported Video Cards: ATI® RADEON® 9600/9700/9800, X300 to X850, X1300 to X1800NVIDIA® GeForce™ 6200/6600/6800/7800

Silent Hunter IV: Wolves of the Pacific screenshots