I just installed an extra GB of DDR ram onto my existing 256MB. When I bought it, I wasn't sure if I needed DDR2 or DDR, I got the DDR and installed it into my computer. I haven't noticed a huge difference yet. Under My Computer, it tells me there is 1.25 GB of ram and I just want to make sure it wouldn't be telling me this if the ram I bought was incompatible. I've never bought ram before or installed it or anything, so I want to be sure I did everything right. Thanks.