I'm contemplating an upgrade of my MP3,1 to an nMP, and I've been putting some thought into what amount of RAM to buy and whether to have it pre-installed. Part of the motivation was some perceived sluggishness on the part of my system; I figured it was degrading a bit with age, many programs, etc. To cut a long story short, I realized just the other day that one of the FB-DIMMs in my MP3,1 went bad. I'm not quite sure when it happened. Anyway, this happened to be from the pre-installed RAM. My MP has been fantastic and it is a testament that it is still quite powerful 5 years after purchase such that I am considering some upgrades to get another few years of use. That said, it is long out of warranty. If some of the memory I'd purchased from a 3rd party manufacturer had failed instead, I could get it replaced for free. I don't think I have this option with Apple. Am I mistaken on that? If that is true, it could be another point in favor of ordering only the minimum RAM from Apple and purchasing the rest from elsewhere.