Buddy of mine is thinking of upgrading the ram in his computer. He is running a P4 with a Intel D915GAG Mobo. right now he has a dual channel 512x2 kit for 1gig of ram. Now I have been told and read in several places that dual channel kits are not designed to run side by side, so you wouldn't want to run 2 512x2 kits in a computer. So he was thinking of pullout the current ram and putting in a 1gig x 2 kit. But what would happen if he just added a 1 gig stick of ram instead of another dual channel kit? would that run ok, or both dual channel's stuck running in dual channel mode if there is one dual channel kit installed. Thanks.