is dual channel property lost on installing 6 GB RAM?

sam1

Journeyman
hi, my mobo supports dual channel ddr2 memory. i have already installed 2x2GB and the dual channel mode is shown in cpu-z. question is - if i install another 2 gb stick (total 6GB), will the dual channel property be lost or 2 sticks will continue in dual channel mode and the 3rd on single channel mode?
 
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