Need 3 monitor support and currently have ATI  X1900XT

I have a single x1900xt and now have 3 monitors I need to power. Is it possible to combine NVIDIA cards and ATI or do I need to purchase another x1900xt? It is important that this setup work both in windows XP as well as OSX. I am planning on connecting a 30" and 2 20" monitors. Anyone have a similar configuration yet or can make any recommendations on a proper setup?
Mac Pro dual 2.66GHz 2GB RAM   Mac OS X (10.4.7)  

For the benfit of others, my (AKA Neurorad) original posts from Macrumors:
I have two Apple XT1900 upgrade kits. Installing the second card can be hazardous - it is a tight fit for slot 3. Removing the adjacent SATA drives will help. The release tabs on the slot sockets can be easily broken off if you do not have good access - I have proven that.
1. Yes, you can install two ATI cards, one in the 16 lane slot 1 position, and the other in either slot 2 or 3. It will not fit in slot 4. Slot 2 shares bandwith with slot 1 and can give you up to 8 lanes each. Slot 3 can give your 4 lanes at most for a card, but leaves slot 1 at 16 - probably the best if a secondary monitor is used on the slot 3 card. BUT - only the Mac OS works properly. Windows XP Pro get confused and the device manager has several additional unusable system components, including the 16 lane PCI express slot. Bootcamp 1.1.1 does not correct this. In Windows, you cannot properly activate a monitor on the second card or properly adjust to monitor attached to the slot 1 card. Not very useful. The grossly reduced bandwith of the second card in Mac OS X and the conflicts in Windows makes this useless for anyone who wants to boot into Windows.
More info: http://developer.apple.com/documenta...mentation.html
There is an application that helps manage the card settings called "Expansion Slot Utility" that appears after you add a card. It is in the /System/Library/CoreSerivces folder.
2. You CAN run the ATI X19000XT in slot 1 and put a Nvidia 7300 in slot 4. Again, Mac OS X handles this without a problem, but - surprise - Windows chokes and cannot use both at the same time.
Next, an RMA for the second card. Any suggestions from anyone??
Windows does boot with either Two ATI or an ATI and Nvidia card. WIth two ATI cards, only one the slot 1 card is active (tested with only one monitor hooked to each). The resolution is too low and cannot be properly set. With an ATI and Nvidia card, I was able to boot into the ATI card on one monitor, again only is low resolutions. I reinstalled the Nvidia drivefr then windows would boot only to the Nvidia card,a lthough at decreased resolution . I did not try the Nvidia card in slots 2 or 3.
I gave up with the second card (either Nvidia or ATI) after no luck in Windows via Bootcamp. I am hope to try again. The presence of the second ATI card in slot 3 messed up Windows Device Manager. Besides the usual PCI slots being flagged before I added anything, the additional ATI card caused the slot 1 driver to report a problem under Device Manager. Even if it worked, running the card in at best a 4 lane slot seems counterproductive (the only way to preserve the full 16 lanes in Slot 1 is to put the additioanl card in slot 3. The ATI card will not fit in slot four (8 lanes) although the Nvidia 7300 can fit in slot 4.

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