After spending months wanting to replace my old nvidia 7300 in my first gen mac pro with the methods posted here, the old card finally died. Luckily, I had VNC running on the machine and was able to do all of my modifications at first using my Ubuntu "craptop".
The card I'm using is the XFX HD-489X-ZSFR.
To get up and running quickly, I didnt worry about flashing the card, I just used Cindori's tool to add the injector and QE_CI kext mods. Worked great!
Thank you Cindori.
Now, for the fun stuff...
I updated to 10.6.2 and hosed my sweet video setup.
After several hours of trial and error, I finally got around to dumping the ROM and flashing the card with the XFX ZDF7 Modified ROM. The boot screen would show then immediately grey screen. So, I removed the video card. Let the machined boot in "headless" mode. Made a vnc connection back into the box, applied the 10.6.2 combo update. Just before reboot, I reinstalled the injector and the QE_CI 10.6.2 exotic package from netkas. After reboot, it looked like all was well. I removed the natit injector and rebooted. Just after the boot loader I got an immediate GSOD. As of right now, I'm having to run the modded rom AND the natit injector. All seems to be ok except the fan speed. I think it is actually running dangerously low, the heatsink and ambient temp in the case is pretty hot. I'm going to attempt to do some rom modding on my own to get that fan speed up quite a bit if possible. I'll be trolling the forums for tips on modding the fan stuff but any advice is appreciated. I do have a Windows 7 partition now so I will be playing around with the ATI goodies there.
Also, uploading my original ROM