The update also improves HD video playback on systems using the Nvidia GeForce 7300 GT or GeForce 9600M GT graphics cards (the dedicated graphics chipset in the latest MacBook Pro models). The GeForce 7300 GT was used in the 24-inch iMac prior to the aluminum models and was also one of the PCI-X graphics cards available for the original Mac Pro models.
The update is available through the Software Update feature of Mac OS X and from the Apple website, and requires Mac OS X 10.5.6.
