I have a laptop that came with 1Gb of DDR (Yes DDR 1 it's old) 333mhz memory. Recently I realized that both sticks were very corrupt, so I had to replace then with 256 MB of the same speed of memory scavenged from my broken Compaq, but my question is can I upgrade my ram to a higher speed? I know I can't upgrade to DDR 2 but will I be able to use 400 Mhz Ram? my computer is a Vaio FS 680W. Thanks in advance for any help.