The Watch Dogs listing on Steam has system specifications that expand upon the minimalist minimum specs revealed last month for Watch Dogs/Watch_Dogs, the upcoming open world hacking game (thanks Polygon). Here's word:

Minimum:
OS: Windows Vista (SP2), Windows 7 (SP1) or Windows 8 (Please note that we only support 64 bit OSs.)
Processor: Intel Core 2 Quad Q8400 @ 2.66Ghz or AMD Phenom II X4 940 @ 3.0Ghz
Memory: 6 GB RAM
Graphics: DirectX 11 graphics card with 1 GB Video RAM - Nvidia Geforce GTX 460 or AMD Radeon HD 5770
DirectX: Version 11
Hard Drive: 25 GB available space
Sound Card: DirectX 9.0c Compatible Sound Card with Latest Drivers
Additional Notes: Broadband connection and service required for multiplayer mode. Supported Video Cards at Time of Release: nVidia GeForce GTX460 or better, GT500, GT600, GT700 series; AMD Radeon HD5850 or better, HD6000, HD7000, R7 and R9 series Intel® Iris™ Pro HD 5200

Recommended:
OS: Windows Vista (SP2), Windows 7 (SP1) or Windows 8 (Please note that we only support 64 bit OSs.)
Processor: Eight core - Intel Core i7-3770 @3.5 GHz or AMD FX-8350 X8 @ 4 GHz
Memory: 8 GB RAM
Graphics: DirectX 11 graphics card with 2 GB Video RAM - Nvidia Geforce GTX 560 ti or AMD Radeon HD 7850
DirectX: Version 11
Hard Drive: 25 GB available space
Sound Card: DirectX 9.0c Compatible Sound Card with Latest Drivers
Additional Notes: Broadband connection and service required for multiplayer mode. Supported Video Cards at Time of Release: nVidia GeForce GTX460 or better, GT500, GT600, GT700 series; AMD Radeon HD5850 or better, HD6000, HD7000, R7 and R9 series Intel® Iris™ Pro HD 5200