The motherboard chipset determines the ram capacity and setup. Tripple channel only means you try to use 3 ram sticks in the proper slots for maximum speed, but I doubt the average person could tell the difference over dual channel. Just get the best deal on 3 sticks you can find, with a lifetime warranty from the manufacturer. There is one Intel x58 board that gives you a choice of dual or tripple channel, but it's not the norm for this chipset.