Just curious if anyone knows if there would be a difference in fan noise between the 2012 i5 & i7 MacBook Airs while doing less intensive tasks like web browsing? Assuming money's not an issue, I am trying to figure out if there is a down side to the more powerful processor. I won't be using the extra power much now (who knows in future years) and I wouldn't want to spoil my user experience with a noisey machine. If there isn't really a difference, the faster processor might extend the useful life a year or two longer. Who knows the answer?