Hi. Long time reader, first time poster. I've been reading all the threads about overheating. I believe I have read every single post of the debate, but I haven't seen anyone else describing what I have experienced. I therefore start this new thread as I believe the unintentional experiment that I will describe in this post will shed some light into the MBA overheating problem. If I by any chance have missed a previous post describing the same results I appologize. First a little background describtions, bare with me, if you are interested in getting to the bottom of the MBA overheating problem I believe the read will be worth it! When getting my week 10 MBA i cloned my MacBook CCC "fresh install" clone onto my MacBook Air. That turned out to be a bad idea since I run into a lot of problems. For instance, since the MBA lacks a ethernet port that messed up Time Machine seeing as that uses "en0" to identify the computer it is cloning. Also system preferences was messed up seeing as the MBA has a completely different trackpad than my cloned MacBook. All these issues (and more) led to the purchase of an external DVD drive and a fresh install of Leopard from the MBA system DVD's. The thing I discovered though, is that while I had the MB clone as my system on the MBA I had NONE of the overheating issues whatsoever. The temp was frequently around 70 Celsius, and even as high as 80 Celsius sometimes. However, I NEVER had a core shut down or any reduced performance. The fans cranked up, but that was it. With my fresh install with the proper system for the MBA, the overheating issues have hit my unit. I now experience all the issues as described in other threads. Core shuts down, and it shuts down quickly, even at temperatures as low as 65-70 Celsius. This difference in performance happened literally from one day to the next, and my habits or usage of my MBA have not changed from that day to the other.. With my low level of computer knowledge I would expect this to evidence that this is software related. That the MBA has set limits to what it is supposed to do, either set on purpose by Apple or set by "buggy" behaviour. These limits seem to be alterable seeing as my MB clone ran cooler and free from MB overheating issues. Again; I believe I have read every single overheating post out there, but could not find an "experiment" like the one I unwillingly have conducted. I think this is important enough to not "get lost" in the other huge overheating threads so I started a new one. If I have missed previous posts concerning this exact issue, I appologize.