For GPU debugging purposes, it is still possible to render with the same BVH2 on the CPU using the Debug panel in the render properties. Note that building Blender without Embree will now lead to significantly reduced performance in CPU rendering, and a few of the Cycles regression tests will fail due to small pixel differences. Ref T73778 Depends on D8014 Maniphest Tasks: T73778 Differential Revision: https://developer.blender.org/D8015