They scale very well, is a triple channel kit 3x2GB, I can get 2200MHz 8-11-8-24-74-1T @ 1.83v with 4500MHz and 43x uncore, they also do 2400MHz 10-17-17-36-88-1T @ 1.83v with 4500MHz and 43x uncore... let's see what I can do with 1.95v!
Yesterday bought a second-hand GSkill PI 1600MHz CL6 2x2GB PSC kit with the same serial as my triple channel kit (11221040....), the idea is to make a 8GB kit with the 5 PI sticks without losing the ability to overclock them.