Not a problem, I'm just bored and have a mystery I'd like to solve. See the images below. On the left is a partial screenshot of the "About This Mac" window from my 12-inch 1.33 GHz PowerBook G4 running Tiger; and on the right is the same info from the same system running Leopard. As you can see, the "Memory" info is reported differently. My question is: why? I used to think this indicated a problem with the system, but I learned better. I've experienced this anomaly on every 12-inch PowerBook G4 I've owned; which includes not only my current 1.33 GHz but also a 1.0 GHz and two 1.5 GHz models. Diagnostics, testing and experience have confirmed that the discrepancy in reporting memory type has nothing to do with any hardware or software defects - at least, none that I've found. On each of these machines, Tiger's "About This Mac" reports the amount as well as the type of memory, while Leopard's only reports the amount, leaving off the "DDR SDRAM" bit. This occurs regardless of the brand or size of memory module(s) installed. Whatever is causing this seems not to affect System Profiler, which reports the exact same memory info in both Tiger and Leopard. Seems like I've also seen this on a few 12-inch iBook G4's, which share some hardware with the 12-inch PowerBooks, so I'm thinking there must be something common between the two that causes Leopard's ATM to miss reporting the type of memory installed. I have never encountered this issue on any other type of Mac. Searching the Internet has been fruitless. Not only have I not found an answer to why this happens, I can't even find where anyone else has mentioned it. It's entirely possible that I'm the only person who cares, but...it...just...bothers me! Does anybody know why this happens?