I'm upgrading the RAM on my aunt's old Gateway 560GE with an Intel 915G chipset and support for dual channel and I have more of an "academic" question than one of great need about dual channel. Namely, it involves the speed of having 3GB dual channel vs. 3.3GB single channel. Their computer isn't that old and their needs aren't that extensive, but I might as well get them the best improvement for the price to help the computer last a bit longer. First of all, I have no indication on how much RAM the thing can take. Gateway specifically says 2GB for the 560GE and then goes on to say that 8GB can be installed due to the motherboard with 4GB of addressable space. Crucial and many other places say it can take 4GB The two purchasing options I'm thinking about involve 3GB or 3.3GB so I'm going to assume here that it can in fact take the 4GB (with an assumption that 3.3GB are addressable due to 32 bit). I have a couple options to buy RAM. Unfortunately the computer now has an odd setup of 1X1GB and 1X256MB and is therefore not taking advantage of its capability of dual channel. It has four total slots. So: Purchasing a 2X1GB set for $60.99 would put it to 3.3GB with 3X1GB and 1X256MB and unfortunately not dual channel. It would be $60.99. I'm leaning toward purchasing a 1X1GB chip for $30.99 and 2X512 chips for $36.99 that would put it up to 3GB when removing the original 256MB chip. The benefit would be gaining dual channel with 2X1GB and 2X512MB for $67.98. Another good option for dual channel is of course purchasing a 1X1GB chip for $30.99 and a 1X256MB chip for $13.48 that would put it up to 2.5GB for $44.47. Any recommendations? I do want to avoid single channel and I know that single applications are limited to 2GB in 32bit XP. Single 3.3GB, dual 3GB, or dual 2.5GB?