Recommended:

OS: Windows Vista SP2, Windows 7 SP1, Windows 8 / 8.1 (both 32/64bit versions)
Processor: Intel Core i5 2400S @ 2.5 GHz or AMD FX 4100 @ 3,6 GHz or better
Memory: 4 GB RAM
Graphics: Nvidia GeForce GTX 570 or AMD Radeon HD7870 (1250MB VRAM & Shader Model 5.0) or better
Storage: 3500 MB available space
Sound Card: DirectX Compatible Sound Card with latest drivers
Additional Notes: Supported video cards at time of release: Nvidia GeForce 8800GT or better, GeForce 9, GTX 200, GTX 400, GTX 500, GTX 600, GTX 700 series. AMD Radeon HD4870 or better, HD5000, HD6000, HD7000, R7 and R9 series. Note: Latest GeForce drivers tested: 331.65 for all series. Latest Radeon drivers tested: 13.9 Legacy for Radeon HD4870 and Windows Vista, 13.9 for Radeon HD5000 and above. Laptop versions of these cards may work but are NOT officially supported.

Assassin’s Creed Liberation HD videos