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Thanks for your answers guys. I used the scanner in the first link, but it lists the only memory on their website compatible as PC2700 and PC3200.
It also says that although nForce4 boards support up to 4GB of RAM that I may only be able to see 2.75 - 3.5GB in the system due to BIOS compatibility with that RAM amount. I looked on the ASUS site, but the latest BIOS is from 2007 and there are no download options for Win7, only as recent as Vista.
I am a little disappointed, but then I guess it's kind of old. It works very well, I just thought it would be nice to have the maximum RAM, since with a view apps open I tend to hover around using just over half of what I've got.
I do not understand the "240pin" answer though. What does that mean?