I think there is an error in Blender benchmark. I7-6900k default speed is 3.2Ghz and boosts to 3.7Ghz (or 4Ghz on Turbo Boost Max 3), so overclocking it to 3.8Ghz can at max give us a 20% advantage. How can it be explained that default 6900k does it's work in 53.27s and overclocked by 20% does...