Possible to Use Radeon 4870 AND EVGA NVIDIA GTX 285 at the Same Time?

Hello,
I just tried to connect a second 30 inch Cinema display to my early 2009 8-core MacPro with a Radeon 4870 card.
The second display maxes out at 1280 x 800 resolution.
I think that is a function of the second port on the 4870, rather than a limitation of the card itself.
To get around this, I ordered the EVGA NVIDIA GTX 285. At $499, that's a big yikes.
Here is my question: Will I get better performance running one 30 inch from the Radeon, and the second from the Nvidia? Can I even install both at the same time? Or should I remove the Radeon and use just the Nvidia?
FWIW, I use this Mac for Photoshop and other image software, and for some stats work. No games. I am using CS4, which would never recognize my 4870. Maybe I will do better with the EVGA NVIDIA GTX 285?
I would appreciate any and all help on this!
Thanks!
Charles

I just tried to connect a second 30 inch Cinema display to my early 2009 8-core MacPro with a Radeon 4870 card.
Are you using the Mini DisplayPort to Dual-Link DVI Adapter?
<http://store.apple.com/us/product/MB571Z/A?fnode=MTY1NDA5OQ&mco=MjkyNjI0Mg>
The second display maxes out at 1280 x 800 resolution.
That's the resolution the 30" will run at with a single-link DVI connection.
I think that is a function of the second port on the 4870, rather than a limitation of the card itself.
It depends on the adapter you use.
To get around this, I ordered the EVGA NVIDIA GTX 285. At $499, that's a big yikes.
It has twice the graphics memory, so may be better if you are processing lots of large images at once.
Here is my question: Will I get better performance running one 30 inch from the Radeon, and the second from the NVIDIA?
No. For only two displays, one card is better because it can handle moving windows between displays, or windows spanning both displays. With the displays on different cards, the main computer has to do more work. Even if the windows are never going to cross display boundaries, there is no way for the applications to know that, so they won't let the graphics cards do as much as they could.
Can I even install both at the same time?
No. There are only two auxiliary power connectors, and one card will use both.
Or should I remove the Radeon and use just the NVIDIA?
Try each card and see which gives the best results with your applications.
FWIW, I use this Mac for Photoshop and other image software, and for some stats work. No games. I am using CS4, which would never recognize my 4870. Maybe I will do better with the EVGA NVIDIA GTX 285?
The extra video RAM may give better performance with lors of large images.

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