Can I use 2x2GB SODIMMs in my PowerBook5,9?

I saw a listing on ebay a few weeks ago for a PowerBook5,9 that had a single 2GB SODIMM installed and working.

I have the same 17" PowerBook and am wondering if it's possible to use two 2GB PC2 4200 SODIMMs to get 4GB of RAM. Has anyone tried this? New Egg has a set of 2GB sticks for about $50.

Thanks.