The term "twined pair" means that two memory modules needed for a dual channel configuration have to be of the same size,type and speed and are sold as such. Adding a one extra module thats is the same size,type and speed to a dual channel set up will disable dual channel mode.
To mantain a dual channeling you have to install memory in "pairs" of the same type. The motherboard manual will tell you the memory configurations it will take.
To mantain a dual channeling you have to install memory in "pairs" of the same type. The motherboard manual will tell you the memory configurations it will take.