A recent update from Apple on the firmware for the MacBook, an addition to an earlier update, has altered the behavior of the internal fan. Due to complaints about excessive noise when the CPU felt it was a little to warm, Apple's adjustments result in an overall smoother fan operation, with a better grace range for when the fan's full speed kicks in. This should result in the notebook being quieter on average. The patch is unusual in its nature, as typically situations that are this minor are something manufacturers tend to ignore, instead relegating firmware updates to flaws found within the device. If you happen to own a MacBook and it's driving you nuts, this may just be your saving grace. One must wonder, though, how much the average temperature of the CPU and motherboard will rise due to the alteration. The installer is fairly simple to use, point and click to the extreme.