https://www.pcgamer.com/assassins-creed-odyssey-system-requirements-revealed/

Ubisoft has released the minimum and recommended system requirements for Assassin's Creed Odyssey, which is due out on October 5. It recommends a GTX 970/R9 290 for resolutions below 4K, and if you want to play in 4K, it recommends a Vega 64 or GTX 1080. The minimum required graphics card is a GTX 660/R9 285.

The full requirements—in the order of minimum, recommended, and recommended for 4K—are below, as published on Ubisoft's website: