I currently have both the 11.6" MBA Ultimate and the 13" MBA Ultimate sitting on my desk as I try to decide which one to go with. I've had the 11.6" since November but have been eyeing the larger SSD and higher screen resolution of the 13" for a while now. So having found a potential buyer for my initial purchase, I decided to pick up a 13" Ultimate, already convinced I would make the switch. However, my first impression was how much louder the 13" is. It was immediately noticeable when running Migration Assistant. Then later, once all my data had been transferred, even running naught but a single Safari window with MacRumors, the fans did not settle down below 2300RPM (as reported by smcFanControl). Stress the CPU's but a little and they flare up to clearly audible levels. Watching some simple YouTube vids is all it takes to trigger this. The 11.6" has been much less prone to these flare ups and generally feels much cooler to the touch. As I tend to run apps like ZBrush and Pixelmator (and yes, even Maya) on my machines, heat is always a concern. I understand that the CPU in the 13" is of the (L)ow (V)oltage variety instead of the (U)ltra (L)ow (V)oltage CPU in the 11.6", and that their TDP's are 17W and 10W respectively, but I am surprised the difference in heat is so great. So surprised in fact that I proceeded to reset the System Management Controller because I thought something had gone awry there. It made no difference. Does anybody else have both and noticed this? Should I take the 13" back to Apple for a replacement or is this completely normal?