A few things: 1. The statement "The RAM limit for any computer is the amount the CPU can address, so your system cannot use more than 1.5 GB no matter how much you install." actually is completely true. 2. I checked--MacTracker confirms what Apple says about their product. No surprise. 3. MacTracker is a great resource. Besides all the technical stuff, it even tells you the Digital Audio system had two code names: Tangent and Clockwork. Steve in Raleigh