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Tonight Ubisoft sent out the minimum specs you'll need in order to run Assassin's Creed 3. Surprisingly, the game doesn't require DirectX 11 video cards or sound cards.
The minimum requirements, posted on Ubisoft's support site, are as follows:
Ubisoft also provided a list of supported video cards. At launch, the game will be compatible with the AMD Radeon HD 3870 / 4000 / 5000 / 6000 / 7000 series or better. NVIDIA owners will need to have GeForce 8600 GT / 9 / 100 / 200 / 300 / 400 / 500 / 600 series or better. Laptop versions of these particular cards could work, but there are no guarantees.
AC3 will arrive on the PC about a month later than on the PS3 and Xbox 360. The PC launch is scheduled for November 20th in North America and the 23rd in Europe.