So i have rx 5600xt and my GPU usage no more than 60% on high settings on FullHD, but CPU usage 15-20% and 2 cores out of 6 with disabled multithread render. However, when enabled multithread render CPU usage increases to 40-45% and all cores are used, in both cases there was a lock FPS to 75 with FreeSync, i.e. CPU load increased even when the framerate is limited. Maybe that enabling this parameter leads to excessive loading CPU if its capacity is insufficient.