We have had a report that on a system that supports Intel Turbo Boost Max Technology 3.0 (an i7-6800K) that when the CPU test was selected it caused the 3D and video tests to start slowly, sometimes display errors (such as 3d test was interrupted) and appear choppy, if the CPU test was not selected then none of the issues occurred.

Even though it was not actively in use once the Intel Turbo Boost software was disabled then the CPU test could be run as well without causing any problems and the issues no longer occurred.