Hey I have an older ASUS P4SD-LA Mobo, I am currently running a 256 stick and a 512 stick of PC2700, I am looking to get more ram, I had a few questions though, should I just get a 1 gig stick and keep everything running in one channel? or can I get a matching 256 and a matching 512 and run it all in dual channel, or save the money and get a 512 stick and dump the 256. I am just trying to get the most bang for the buck. I am kinda confused on how dual channel works, can I run to matching sets of different sizes 2x 256 and 2x 512 in dual channel?