Snow Leopard and ATI cards

I have a 800 MHz RAM bus mac pro (a 2008 model). It shipped with an ATI Radeon 2600XT graphics card (and OSX Leopard 10.5). I then upgraded to a SECOND graphics card which is the NVIDIA 8800GT. With Leopard OS the two cards played nicely together.
However, after upgrading to 10.6 the ATI card no longer works properly.
booting 10.6 in 64 bit kernel (the default) with the ATI card installed is un-successful (with the ATI card in the machine, it WILL NOT BOOT.)
My suspicion is that the ATI firmware does not support the 64bit kernel because when I boot the mac pro in 32 bit kernel mode the machine boots and the ATI card is recognized (displayed in system profiler: BUT DOES NOT OUTPUT VIDEO!) When reverting and booting from 10.5 (anyway a 32bit kernel system) the machine boots EXTREMELY SLOW and the ATI card is visible BUT NOT USABLE. When shutting down the computer (in verbose mode) I get about 12 screens of ATI debugging codes before the machine powers off (this all flies by very very quickly).
I see on the apple support downloads an updater called:
ATI Radeon HD 2600 XT Firmware Update
HOWEVER, the installer will not let me install this update even when I do get my machine booted in Leopard with the card installed, because it tells me I need the Leopard Graphics Update (it's a 10.5.8 system...) ***?
when i completely remove the NVIDIA card from the computer and attempt to ONLY use the ATI card, nothing works. NADA.
Is my only chance to get 4 video outputs from this machine to buy a second 8800GT?
I know that the ATI card is not fried, but that there is a driver or firmware problem. how can I fix this issue? thanks in advance,
|K<

ATI 2600XT is an iffy card.
Early shipped models of that card had a firmware update, newer cards were 'fixed' and didn't need the firmware update. Firmware only seemed to make its fans run more and be louder and was annoying.
A lot of things happened with 10.6.4 and graphics. Even video out issue. Some have downgraded to 10.6.3.
There are 4 other options also:
GT120 is cheap and fine
8800GT is EOL and ebay only, and look for "2nd generation Apple Mac Pro"
ATI 4870 or wait to see if Apple comes out with 5800s
Nvidia GTX 285 ($450)
Some cards require 2 power connectors, the GT120 does not need any.
Wait for 10.6.5+ or downgrade to 10.6.3 and see how that works
Mac Pro 2008 required an EFI on graphics cards to work with the UEFI/EFI64 so I am unsure that the card or its BIOS is an issue... but haven't seen much of that.
10.5.2 era there was a Leopard Graphics 1.0 update that was rolled into 10.5.3.
I'd ditch and get the GT120 or wait and see if GT3xx.

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Message was edited by: donv (The Ghost)

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