Is it possible for me to do it? I have 2 x 256MB and 1 512MB. My mobo has 3 ram slots, 2 green, and 1 purple. To do dual channel with two sticks, i put one in the purple and one in the green. Can i get 1024MB of dual channel by putting the 512 in the purple slot and the 2 256 in the green slot? I'd liek to use all of the ram modules.