I have an Early 2008, 2.4 GHz 20" iMac. It still serves me well and I have no reason to replace it or otherwise get rid of it; however, I have 2 GB RAM installed, which is half the maximum allowance for this model. So, I decided to expand the RAM, and started scanning the web for instructions on how to do this. The first piece of information I was able to find was that my model (and make no mistake, this is an early 2008, 2.4 GHz model) runs on 800 MHz DDR2 SDRAM, and that this is what I should be looking for. However, when I opened up About This Mac / System Profiler, the computer told me that it has 2 X 1GB 667 DDR2 SDRAM installed. So, what's going on? Is this a manufacturer's mistake? And what should I do - should I get 667, or 800 for the remaining 2 GB?