Go to 8GB on your notebook for ~$350http://blogs.technet.com/roblarson/archive/2008/10/08/go-to-8gb-on-your-notebook-for-350.aspxSome vendors have started shipping DDR2-5300 memory that provides 667Mhz 4GB SODIMMs for you notebook. You will need a notebook that has a SantaRosa chipset to be able to access all 8GB and even then the BIOS has to support it. I personally purchaseden-USCommunityServer 2.1 SP1 (Build: 61025.2)