Although the information appears to have been pulled, the Uplay download page for the PC version of Watch Dogs supposedly provided the system requirements. Luckily the specs were snatched up and posted over on NeoGAF before they disappeared, revealing that Watch Dogs on PC only supports 64-bit operating systems: Windows Vista (SP2), Windows 7 (SP1) or Windows 8.
According to the post, Ubisoft provided four sets of system specs: Base, Minimum, Recommended and Ultra. The first "Base" list stated that the game will only support 64-bit platforms, and will require 20 GB of space on the hard drive, a DirectX 9.0c compatible sound card with the latest drivers, and a broadband Internet connection for multiplayer mode.
For the "Minimum" requirements, PC gamers will need a DirectX 11 graphics card with 1 GB of video RAM, a quad-core processor, and 4 GB of RAM. Prime examples are Nvidia's GeForce GTX 460 and AMD's Radeon HD 5770 on the GPU front, and Intel's Core2 Quad Q6600 or AMD's Phenom X4 9750 on the CPU front.
The "Recommended" specs for PC gamers is a bit more meaty, requiring a DirectX 11 graphics card with 2 GB of video RAM, an eight-core processor and 8 GB of RAM. Qualified hardware includes Nvidia's GeForce GTX 560 Ti and AMD's Radeon HD 7850 in the GPU department, and Intel's Core i7-3770 and AMD's FX-8350 for CPUs.
Finally, we have the "Ultra" group. To meet this requirement, gamers will need a DirectX 11 graphics card with 2 GB of video RAM or more, the latest eight-core CPU or more, and 8 GB or more RAM. This includes Nvidia's GeForce GTX 670 and AMD's Radeon HD 7970 for GPUs, and Intel's Core i7-3930K and AMD's FX-9370 for CPUs.
Watch Dogs is slated to arrive on the PC, Xbox 360, PlayStation 3 and Wii U on November 19. Release dates for the Xbox One and PlayStation 4 versions are currently unknown. The PC version will also support exclusive Nvidia features as part of Ubisoft's alliance with the GPU company, and will likely play a major role in Nvidia's Battlebox initiative this holiday season.