Thanks for more info,
Always run installation files "As Administrator".
SimCity uses DX9; your card comes with DX12, I think, which should be backwards compatible but sometimes doesn't switch as easily as it should. Try running the dxdiag setup from the SimCity installation files. Default location is \Program Files (x86)\Origin Games\SimCity\__Installer\directx\redist Right-click dxsetup.exe, choose "Run as Administrator", agree to the prompts and let it install, even if it says it's already installed.
Firewall and Antivirus - Make sure SimCity.exe and Origin.exe are added to exception lists. If you have BitDefender installed, disable it.
Graphics drivers and Windows OS are patched and updated to newest versions. (*Very Important* for Radeon cards in particular, there was an issue with some drivers in 2017/18; find the newest drivers for your card here: https://www.amd.com/en/support
SimCity.exe and Origin.exe - Set them to run "as administrator"
Disable Origin in-game In Origin main menu, right-click SimCity icon, Game Properties, check the box that says "Disable Origin In-game"
Run in Windows 7 or 8 compatibility mode - right-click SimCity shortcut; choose Properties > Compatibility tab > Check the box to run in Win 7 or 8 compatibility mode
Monitor Settings - SimCity does not work with dual monitors, so set it to use one only. Also, no higher than 1080p resolution (no 4k)
Definitely post back and let us know whether something worked. If it still won't render properly, reply back with any error messages you're getting and attach a dxdiag report. How to Dxdiag