In my country, for a very brief period of time, I have the opportunity to buy 2012 MBA 11" for $300 less than the 2013 MBA 11" both brand new, unopened. The *only* thing I care about is the fan noise, I want to make sure it stays at or below 2000 rpm as long as possible. I currently have a MBA 11" (Mid-2011). Under 21C degrees (70F) room temperature it stays at 2000 rpm with Skype audio only and Firefox. Normally I would buy the 2012 for 300 less, but if the new Haswell is more silent (with the lower TDP and all) then it's worth for me to pay 300 more. I don't care about the storage, battery, ram etc. and I will buy an 11" for sure. I will appreciate any insight about those two machines, thanks in advance.