Watch Dogs Minimum and Recommended Requirements

Minimum:

CPU: Intel Core 2 Quad Q8400 @ 2.66Ghz or AMD Phenom II X4 940 @ 3.0Ghz
RAM: 6 GB
OS: Windows Vista (SP2), Windows 7 (SP1) or Windows 8 (64 bit only)
Video Card: DirectX 11 graphics card with 1 GB Video RAM - Nvidia Geforce GTX 460 or AMD Radeon HD 5770 / Intel Iris Pro HD 5200
Sound Card: Yes
Free Disk Space: 25 GB

Recommended:

CPU: Core i7 3770 @ 3.5Ghz or AMD FX-8350 @ 4.0Ghz
RAM: 8 GB
OS: Windows Vista (SP2), Windows 7 (SP1) or Windows 8 (64 bit only)
Video Card: DirectX 11 graphics card with 2 GB Video RAM - Nvidia Geforce GTX 560 ti or AMD Radeon HD 7850
Sound Card: Yes
Free Disk Space: 25 GB