Courtesy of the fine folks at Ubisoft Support, below is what you'll need should you ever hope to take a tomahawk to the Brits.
"In order to run Assassin's Creed III properly, your PC MUST meet or exceed these minimum requirements:
Minimum System Requirements
Supported OS: Windows Vista (SP2) / Windows 7 (SP1) / Windows 8
Processor: 2.66 GHz Intel Core2 Duo E6700 or 3.00 GHz AMD Athlon 64 X2 6000+ or better recommended
RAM: 2 GB (4 GB recommended)
Video Card: 512 MB DirectX 9.0c-compliant with Shader Model 4.0 or higher
Sound Card: DirectX 9.0c-compliant (5.1 surround sound recommended)
DVD-ROM: Dual-layer drive
Hard Drive Space: 17 GB
Peripherals Supported: Windows-compatible keyboard, mouse, optional controller (Xbox 360 Controller for Windows recommended)
Multiplayer: 256 kbps or faster broadband connection
Supported Video Cards at Time of Release:
AMD Radeon HD 3870 / 4000 / 5000 / 6000 / 7000 series or better
NVIDIA GeForce 8600 GT / 9 / 100 / 200 / 300 / 400 / 500 / 600 series or better
Laptop versions of these cards may work, but are not supported. These chipsets are the only ones that will run this game."
Assassin's Creed 3 brings the centuries of dispute between the Assassins and Templars to American shores. Players take on the role of Connor, a Mohawk Indian Assassin during the American Revolution. Players will encounter many historical figures including Paul Revere, George Washington, Ben Franklin, and more. Combat and movement have been completely re-worked from the ground up, so Connor can take on the Templars in colonial New York, Boston, and the American frontier.
If your gear isn't up to date, you still have time. Assassin's Creed 3 arrives on PC on November 20, in the US, and November 23 in the UK.