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Was undervolted by -0.1V when arrived with Cinebench R20 score of ~2,400. Able to further undervolt to -0.165V for ~10% increase in Cinebench R20 score to ~2,600. Needed to use ThrottleStop to undervolt as Intel XTU's settings would not stick. Didn't see any difference in Cinebench R20 score with Turbo on or off.