An issue that has plagued early 2009 Nahalem-based Mac Pros has been purportedly rectified with a small update from Apple. The issue would cause a 20 percent performance drop when audio was played in Mac OS X, and playing music in iTunes causes temperatures to sore in the Mac Pros.
Apple issued an update yesterday with an aim to fix the issue is available through software update. The 1.6MB download is described by Apple to "reduces processor utilization during audio activities, such as playing or recording music."