Render bug

The final image get unnecessary artifacts, after rendering. These artifacts are not visible in the preview window. It depends of image resolution. More resolution - more artifacts… And, more artifacts - if render starts from preview (not real time) version of window. But white model don’t have any of this artifacts.

Answer - When level of “Metal” parameter of material above 0.00, then artifacts shows up.

Images was rendered on ASUS ROG g731 laptop with RTX 2070 in 4800x2700 pixels.