my plan is ultimately to end up 6x4G, as i can afford more RAM. i just upgraded my GC to gtx750ti, & i bought the 2x4G sticks to help keep up. but i have heard conflicting reports about only swapping out 2. i've been told that it's a 2 channel system, color coordinated slots; and i've been told it's 3 channels (a1,a2,b1,b2,c1,c2). dell sucks, & i'm not paying another $100 just to have access to their crappy support. i really want to put these in, it's like staring at cookies i can't eat, but i'm not trying to brick just cuz i don't really know what i'm talking about.