Mac Pro 8,1 Two ATI Cards not visible in XP

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Level 1

8 points

Mac Pro 8,1 Two ATI Cards not visible in XP

I've been on quite a journey.

My end goal is to have XP recognize my two ATI Cards (HD 5800 & 9800 XT).

What I've gotten so far is if I remove One of the cards I can install the appropriate Driver (HD 5800).

However when I plug the second card in and boot up I get an error saying the ATI Driver is not installed and neither card is recongnized.

Device manage doesn't even shoe the VGA compatible device.

So, is there a way to either get both cards running OR have it toally ignore the second card/display so I can still have the machine see that I have the HD 5800?

I'm going bald from all the head scratching.

Thanks in advance

Mac Pro, Windows XP Pro, Two graphics cards in XP

Posted on May 30, 2011 4:51 PM

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Answer 1

The hatter

Level 9

60,980 points

May 31, 2011 6:39 AM in response to feedlot

The Mac Pro workstation last model was 5,1.

Why would you want a 2nd ATI card anyway that is that old.

The other thing, my nVidia 9800GTX requires power and a Mac Pro only has enough to power the 5800.

Besides, you want to use a Mac Pro, and use your system, you will need Windows 7 x64.

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Answer 2

feedlot Author

Level 1

8 points

May 31, 2011 7:01 AM in response to The hatter

OK, My bad. Its 1,1.

How I got to this point as far as hardware.

the MacPro came with the 9800XT.

I bought an apple cinema Display with mini display port.

I then bought the HD5800.

I'm happy with what I have it works great in 10.6.7

That said my question still stands, I think.

Will XP simply not allow me to use these two cards?

Will windows 7 x64?

This is a simple matter of because its there and the ability to fire up steam and play the games my buddies are.

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