I don't own nor have I used a Classified, but I would imagine running 1.4v vIOH for only 204.5 bclk is a massive overkill. Try ~1.15v. Also, although you may have another issue, you probably need to raise CPU Vtt to get DDR3-2000 MHz, although how much you need here is really dependent on your CPU's IMC. You may find you require 1.45 - 1.55v Vtt.