Apple has introduced a new graphics upgrade kit for Mac Pro users, the NVidia GeForce 8800GT (1st Generation) Graphics Upgrade Kit, though it's currently only available through Apple's US store.
The graphics processor features 512MB of dedicated GDDR3 memory, uses the PCI Express interface and includes two dual-link DVI ports for connecting up to two 30-inch Apple Cinema Displays.
The release of the kit means earlier firmware problems making the 8800GT processor compatible with the Mac Pro have been ironed out.
The card is distinct from the previous Nvidia 8800GT upgrade kit which was available only for Early 2008 Mac Pros, Apple explains: "Note to owners of Mac Pro (early 2008): Please select the NVIDIA GeForce 8800 GT (early 2008) Graphics Upgrade Kit for Mac Pro." This kit requires a Mac Pro (bus speed 1.33GHz) with PCI-Express. The kit costs $279.