Assassin's Creed Revelations:
Assassins Creed Revelations Minimum System Requirements
OS: Windows® XP / Windows Vista® / Windows® 7 (only)
CPU: 1.8 GHz Intel® Core™2 Duo E4300 / 2.4 GHz AMD Athlon™ 64 X2 4600+
RAM: 1.5 GB Windows XP / 2 GB Windows Vista, 7
GFX: 256 MB DirectX® 9.0c-compliant video card with Shader Model 3.0 or higher (see supported list)*
DX®: DirectX 9.0c-compliant
HDD: 12 GB of free hard disk space
Audio: DirectX 9.0c-compliant
Other: Windows-compatible keyboard, mouse, optional controller (Xbox 360® Controller for Windows recommended)
Multiplayer: 256 Kbps or faster broadband connection
Internet: Temporary broadband connection required for one-time product registration at first launch, permanent broadband connection required for multi-player.