Other DX11 games works perfectly. Artifacts are only on Arma III. Those specific artifacts are always on that showcase exactly at same place before showing car. Also sometimes there are some minor visual artifacts during other showcases or missions. When game crashes during other showcases (not vehicle) no artifacts appears before crash.
P.S. DX11 games I played without problems - Crysis 3, Civilization 5, BioShock Infinite, Far Cry 3