Assassins Creed: Revelations

Minimum
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)

Supported Video Cards at Time of Release:
ATI Radeon™ HD 2000 / HD 3000 / HD 4000 / HD 5000 / HD 6000 series
NVIDIA® GeForce® 8 / 9 / GT 200 / GT 400 / GT 500 series.
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.

Recommended 

CPU: 2.6 GHz Intel® Core™2 Duo E6700 / 3.0 GHz AMD Athlon™ 64 X2 6000+ or betterRAM: 2 GB (XP) / 4 GB (Vista/7)
GFX: 512MB - GeForce GTS 250 / Radeon HD 5670 512MB (see supported list) 

Supported Video Cards at Time of Release:ATI Radeon™ HD 2000 / HD 3000 / HD 4000 / HD 5000 / HD 6000 series
NVIDIA® GeForce® 8 / 9 / GT 200 / GT 400 / GT 500 series.
Audio: 5.1 Surround sound card recommended
Other: Xbox 360® Controller for Windows recommended

Game Release

EU Release Date:Dec-01-2011
US Release Date:Nov-29-2011

Official Website http://assassinscreed.ubi.com/ac3/en-GB/home/index.aspx