I just ran 2x "yes" in terminal for the past 2 hours on my MacBook Air, Rev A and no core shutdowns or overheating. The temps maxed out at 83 deg C with fans at 6200rpm. Once I exited terminal, the fans dropped to 2500rpm within a minute. Has the newer ones been "fixed" of many of the problems? The serial number says I'm a Week 14 in the year 2009.