I had one in my heavily upgraded Digital Audio. Worked fine. It's a PC version that I had one of the guys at strangedogs.com flash with the Mac ROM. I took it out because of heat problems inherent in the DA case design, and I'm not cutting any holes in the case. Currently using a 9000 Pro.
As to the OP, if the Mac boots up, it's working. As mentioned earlier, the 9700 was only offered for a very short time as an OEM part in the MDD models. It was never a retail part. So, you'll have to make due with the ATI drivers Apple distributes with the OS.