I have a P4 computer with 128 mb of non-ecc RDRAM. I have to have two sticks in at all times. My question is, do both sticks have to have equal amounts of memory? For example, can I leave one of my 64mb sticks in and then buy just one stick of 256? That would leave me with 320 total which is fine by me. My guy instinct tells me this isn't possible but I'm hoping I'm wrong.