If your 2009-era Mac Pro with Nehalem-based Intel Xeon processor gets unusually hot (like doubly hot) when playing audio through iTunes or a number of other applications, you might want to download Mac Pro Audio Update 1.0. This update reportedly reduces processor utilization during audio activities, such as recording or simply playing music.
Download the update HERE.
This update is for Mac Pro (Early 2009) computers running Mac OS X v10.6.2. This update reduces processor utilization during audio activities, such as playing or recording music.
For detailed information on this update, please visit this website: http://support.apple.com/kb/HT4034