Aqui fica os requesitos oficias da Ubisoft, para versão PC de Assassin’s Creed.Requisitos mínimos:
Supported OS: Windows XP / Vista (only)

Processor: Dual core processor 2.6 GHz Intel Pentium D or AMD Athlon 64 X2 3800+ (Intel Core 2 Duo 2.2 GHz or AMD Athlon 64 X2 4400+ or better recommended)

RAM: 2 GB (3 GB recommended)

Video Card: 256 MB DirectX 10.0-compliant video card or DirectX 9.0-compliant card with Shader Model 3.0 or higher (512 MB video card recommended) (see supported list)*

Sound Card: DirectX 9.0 or 10.0 compliant sound card (5.1 sound card recommended)

DirectX Version: DirectX 10.0 libraries (included on disc)

DVD-ROM: DVD-ROM dual-layer drive

Hard Drive Space: 12 GB

Peripherals Supported: Keyboard, mouse, optional controller (Xbox 360 Controller for Windows recommended)

*Supported Video Cards at Time of Release: ATI RADEON X1300-1950 / HD 2000 / 3000 series NVIDIA GeForce 6600-6800 / 7 / 8 / 9 series

Laptop versions of these cards may work but are NOT supported. These chipsets are the only ones that will run this game.

NOTICE: This game contains technology intended to prevent copying that may conflict with some disc and virtual drives.