2K Games has posted the PC system requirements that you need in order to run Civilization 6. The requirements were posted on the Steam page for the game.
Minimum
OS: Windows 7 64bit / 8.1 64bit / 10 64bit
PROCESSOR: Intel Core i3 2.5 Ghz or AMD Phenom II 2.6 Ghz or greater
MEMORY: 4 GB RAM
HARD DRIVE: 12 GB or more
DVD-ROM: Required for disc-based installation
VIDEO CARD: 1 GB DirectX 11 Video Card (AMD 5570 or nVidia 450)
Recommended
OS: Windows 7 64bit / 8.1 64bit / 10 64bit
PROCESSOR: Fourth generation Intel Core i5 2.5 Ghz or AMD FX8350 4.0 Ghz or greater
MEMORY: 8 GB RAM
HARD DRIVE: 12 GB or more
DVD-ROM: Required for disc-based installation
VIDEO CARD: 2 GB DirectX 11 Video Card (AMD 7970 or nVidia 770 or greater)
Other Requirements
Initial installation requires one-time Internet connection for Steam authentication; software installations required (included with the game) include Steam Client, Microsoft Visual C++ 2012 and 2015 Runtime Libraries, and Microsoft DirectX. Internet connection and acceptance of Steam Subscriber Agreement required for activation.
Civilization 6 is out on October 21st exclusively for the PC.