Agreed. Even the shift from 2133 to 2666 had a huge impact on performance for me... Both perceived performance and measurable (benchmark) performance. With DDR4-2133, I got a Firemark score of 7312.. With DDR4-2666, I got a Firemark score of 10546.. Yes, my scores are a bit low. That's what happens when your system runs too much crap in the background.... I'm also still tweaking settings, new platform and all.