My board is an MSI 865G Neo 2 and there are four memory slots. According to the manual if you have two sticks they should be in slots 1 and 3 for dual channel like you said. However the manual also describes that all four slots can be used for dual channel if you have 4 sticks. It also describes that each slot can be used in single channel mode. This is where I get confused. If you have 4 sticks installed, how do you know if they are working in dual channel mode or single channel? Sorry for the long-winded question.