I have 2gb memory on my Dell Studio 540 desktop. Two 1gb cards. Looks like slots 1 and 3. If I get two more 2GB cards (total of 4 more) to take it up to 6gb will that work? Do I need to move the cards, i.e. four cards, 2 1gb cards and 2 2gb cards? I don't know enought to fill out the sub-catagory so I defaulted to the first one. Please ignore until I am more educated.