Here are the Assassin’s Creed III System Requirements (Minimum)
CPU: 2.66 GHz Intel Core 2 Duo E8200 or 2.66 GHz AMD Athlon II X4 620
CPU SPEED: Info
RAM: 2 GB
VIDEO CARD: 512 MB DirectX 9.0c-compliant with Shader Model 4.0 or higher (GeForce 8800 GT or Radeon HD 4850)
DEDICATED VIDEO RAM: 512 MB
PIXEL SHADER: 4.0
VERTEX SHADER: 4.0
OS: Windows Vista (SP2) / Windows 7 (SP1) / Windows 8
FREE DISK SPACE: 17 GB
SOUND CARD: Yes

Assassin’s Creed III Recommended Requirements
CPU: 2.6 GHz Intel Core 2 Quad Q9400 or 3.0 GHz AMD Phenom II X4 940
CPU SPEED: Info
RAM: 4 GB
VIDEO CARD: 1024 MB DirectX 10 compliant with Shader Model 5.0 or higher (GeForce GTX 460 or Radeon HD 6850)
DEDICATED VIDEO RAM: 1024 MB
PIXEL SHADER: 5.0
VERTEX SHADER: 5.0
OS: Windows Vista (SP2) / Windows 7 (SP1) / Windows 8
FREE DISK SPACE: 17 GB
SOUND CARD: Yes