I have the MBA Late 2008 model, and when I got it it had 2x1GB memory bricks. I upgraded to 1x1GB and 1x4GB a few months ago, and now I want to upgrade to 2x4GB. But on Apple.com they say I can only have 4GB ram. On MacTracker (Application) they say I can only have 8GB ram. And I've also heard that I can only have 6GB. What is the correct answer? As I said, I currently have 5GB total. And that works just fine. But does this mean that I don't really need that one more extra? Like does the computer just ignore it? Or what can I gave?