AMD Radeon R9 390 Not Compatible?

[ManteoMax]

Make sure you read through the available support threads:

@HeliosT10

Here is a list of currently known issues for Forza Motorsport 6: Apex.

Some graphics cards may not have supported drivers available

Some cards may not have supported drivers released that meet the game’s minimum driver version. If you have the latest driver version available from your graphics card manufacturer but are still blocked from launching the game with an “AP301” error, you can attempt to bypass this block by holding “Page Up” while selecting the Quit button. Be advised that bypassing this pop-up may result in game instability and / or poor performance.