I currently have 1 GB PC 3200 2 x 512 in dual channel), and want to increase a bit. I've noticed large files in Photoshop and other programs hogging close to all of my ram so it's time for more. If i were to add 1 more 512, would it actually slow things down by getting rid of dual channel? Am I better off spending more for 2 new 512's to keep in dual channel, even if the extra 512 won't really be needed? I don't really want 2 256's (for the record - tigerdirect has Ultra brand 512 MB for $40 AR, which is why I don't want to pay the same for 256) Hope that makes sense...