The ATI 9600 AGP card does not appear to be a good choice for upgrading the graphics on a dual G5 Mac.
Yesterday and today I went through at least a dozen cycles of shut down computer, open computer, swap graphics cards, close computer, reboot in safe mode, reboot in normal mode, in a failed attempt to upgrade my dual G5 Mac desktop’s graphics card. I’d really like to get my 30″ Cinema Display connected to this machine.
I just got off the phone with a senior support tech at ATI/AMD. He told me that there are known issues with this particular card in a G5 running the latest sub-version of Leopard (10.5.5). He suggested that I revert the computer to 10.5.4 or earlier, which I am not willing to do.
I asked about driver updates. They are no longer provided separately by ATI. The senior tech I spoke with says he believes there will be a compatible driver update in Leopard 10.5.6. I’m just going to RMA the card. I’ll just live with the older graphics card, and the smaller monitor, until I replace this G5 with an 8 core Intel Power Mac (how many days until MacWorld?).