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Here are the Alan Wake's American Nightmare System Requirements (Minimum)
CPU: Info
CPU SPEED: Dual Core 2 GHz Intel or 2.8 GHz AMD
RAM: 2 GB
VIDEO CARD: GeForce 8800 GT or Radeon HD 2900 Pro
DEDICATED VIDEO RAM: 512 MB
PIXEL SHADER: 3.0
VERTEX SHADER: 3.0
OS: Windows XP/Vista/7
FREE DISK SPACE: 8 GB
SOUND CARD: Yes
Alan Wake's American Nightmare Recommended Requirements
CPU: Info
CPU SPEED: Quad Core 2.66 GHz Intel or 3.2 GHz AMD
RAM: 4 GB
VIDEO CARD: GeForce GTX 275 or Radeon HD 4870
DEDICATED VIDEO RAM: 1 GB
PIXEL SHADER: 4.0
VERTEX SHADER: 4.0
OS: Windows 7
FREE DISK SPACE: 8 GB
SOUND CARD: Yes

System Requirements
OS *: Microsoft Windows Vista (Windows XP is unsupported)
Processor: Dual-core CPU with SSE3 (Athlon 64 X2 4200 / Pentium D 3GHz)
Memory: 2GB System Memory.
Hard Drive: 10GB of free drive space.
Graphics: DX10 compatible graphics card with 256 MB of memory. ...
Sound: 100% DirectX 10 compatible sound card.