This seems to be a well known issue with old drivers that should have already been fixed (for example here: Windows 10 Far Cry 4 CrossFire Issues )
Unfortunately I have the same Issue with my Raven Ridge APU. There are purple spots on the outlines of the trees were they meet the sky. Is there a way to fix this? Changing the ingame graphics settings did not resolve this issue.
Here are my specs:
MSI B350M Pro-Vdh (Bios Version 7A38vAB)
G.Skill Ripjaws 4 8Gb 2666Mhz
Windows 10 64
Radeon Software 17.7
Far Cry Version 1.10.0
Thank you for your support
You can install the new driver available here : Radeon Software Adrenalin Edition Q2 2018 Release Notes
Note : It is essential that you reboot the system after you install these drivers.
Please submit your feedback on any issues with this driver here.