Mac Pro and Video Performance

Apple has published a TechNote related to a video performance issue that might affect some MacPro.
No stress. This “low video performance” problem is due to the OSX version pre-installed on those machines. To solve the issue, simply, reinstall OSX from the supplied Install DVD.
If the build number of the pre-installed OSX is 8K1054 or anything less than 8K1079, then you have to reinstall Tiger (shipped Install DVD Build 8K1079); it should fix the issue.
Direct link to the TechNote 304198