I bought the 2600 XT at the Apple online store. It's the same graphic card you can buy for the new Mac Pros, but it also works on older Mac Pros.
There are many graphic issues reported by users of the 2600 XT on both Mac Pros (old and new). Now Apple apperently is fixing them with the firmware updater. But on my old Mac Pro the updater does not work. It's says that the firmware update is not necessary. And that's what I am complaining about... You need a new Mac Pro to run the updater.
Yes, I guess, that's the reason, why I cannot install the firmware update. Sometimes Apple is so annoying... They do not let me use the Radeon 2600 XT on my old Mac Pro although it works (but unfortunately with graphic issues)...
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ATI Radeon HD 2600 XT Firmware Updater
There are many graphic issues reported by users of the 2600 XT on both Mac Pros (old and new). Now Apple apperently is fixing them with the firmware updater. But on my old Mac Pro the updater does not work. It's says that the firmware update is not necessary. And that's what I am complaining about... You need a new Mac Pro to run the updater.
ATI Radeon HD 2600 XT Firmware Updater