I have another 2GB (2 x 1GB) ready to install in my Pro when it arrives. I know that I should keep the 1GB (2 x 512) on one of the riser cards and put the additional memory on the other riser card. I’ve also seen it stated that the larger memory should be on riser card one and the smaller memory on riser card two. The question is can I pull out both riser cards, slide the one with the pair of 512MB modules into the number two position, add my new memory to the other card, and then slide that into the number one position, or do I need to pull the two 512MB sticks off the riser card its on and move it to the other card. Or more simply put can the position of the cards be swapped or do they need to be in their original positions.