I was just thinking, lets say in a year or so down the road I want to add another 1Gb to my computer, will I be able to and leave the memory frequency @ 400Mhz? I heard on socket 754 you can only have 1Gb and anything more will not work correctly, or at its full speed? Im using 2x512 right now, and i have another DIMM left. Check sig to rig info.