Hello everybody. This seems like an excellent board, and I thank you for all your help.

I have an Acer Aspire 1681LCi with 512MB PC2700 (2x256) 200pin Sodimms. The CPU is the Centrino Pentium M 1.5Ghz supposedly with 400MHz FSB (4x100). I would like to add more RAM to it, but have three questions:

1. Should I just add more DDR333 or replace it all with DDR400?
2. Should there be a performance benefit to this?
3. Why would Acer install DDR333 into a 400MHz FSB?

Any suggestions would be helpful on this matter.
Thanks!

no performance benefits at all since you can't overclock a notebook. Just get the speed you are supposed to get (DDR2700 probably since you're using that already) or whatever is closest...