citação:Addresses fan performance issues, customers seem pleased with the results
Apple today released a new firmware for the MacBook line of notebooks. The new firmware adjusts and manages fan speed for the MacBook. Apple previously released a similar firmware for the MacBook Pro, citing heat issues and whine complaints. Since the MacBook's formal release, there have not been as many issues with heat as there was with the MacBook Pro.
Details on what exactly the new SMC firmware addresses are scarce but users who have tried the new update say that their MacBooks are running anywhere between 15C and 20C lower than before. The fans inside the MacBook also appear to be constantly running now, although still keeping quite a low noise output.
Those with MacBooks can obtain the new SMC firmware by running Software Update or check out the firmware details here.