I have a sony PCG-FRV26 notebook. It originally came with 512 mb of ram. 2-256 sticks pc2100. I know that I can upgrade the notebook to a gig and I did this using 2 512 sticks that are rated at 2700 but will also work at 2100. I check bios and it says that the computer has like 492 mb or something around there. It's the same thing when I check in windows itself. I tried each stick individually and I get 192 mb from each stick. Not really sure why it won't recognize all ram. I ran a Pc Wizard 2007 and that showed that I had Gig installed. Definitely not right because the computer is just as slow as before.