Operating system: Windows 10 pro
Graphics card: 1080ti
PC: AMD 2990WX, 4x16GB ram
Broken: 2.8 date: 2018-12-24 14:03
the rendering uses 25% CPU load
auto-detect 64threads, or fixed 64, both same issue,
render output image size 1920*1028, tile size 16*16, progresive rendering does not work - shows tile rendering
the problem does not occur in blender 2.79 - the load is close to 100% there.