dual graphics cards in a Mac Pro

Hey all, well some of you out there will be pleased to know that I am moving to the other side of the PC aisle pretty soon and am buying a Mac Pro (but I will install windoze on it). Anyway, I will be buying the ram and a second 1tb HD for it off the internet instead of paying apple's exorbitant prices, but I am wondering if anyone has any knowledge about installing a second GPU in the computer.

I am ordering it with the Nvidia 8800 GT chip, but I probably wouldn't buy a second until this fall incase the rumor that the 9800 GTX will become available for mac is true.

Regardless I am confused as to how multiple cards in a mac work. I have seen mac pro's with multiple cards for use with more than two screens, but the motherboards don't actually support ATI crossfire/Nvidia SLI so would there be any actual performance increase for someone out there who *cough* wants to play crysis *cough* and putting the second card in. I have heard that using an SLI ribbon cable (not bridge) will allow *some* performance increase. But I have yet to see any definite answer on google, or the apple forums on the issue. I figured mabye some of my trusty POTN'ers could help!

Thanks,

The Mac Pro supports PCI Express 2.0, it will just be a matter of drivers. As to "combining for processing power. You may find that with the right card, in single slot you will have LOTS of processing power.
In a Mac you can span the image or set up the system to stack, etc but that is with the native OS. If using windows, it's the same game as your windows PC.

SLI Nvidia cards will not work in the Macpro. The drivers will only support nvidia chipsets and the macpro is using a intel chipset. You can possibly run two nivida cards to power multiple monitors, but sli will not be activated.

So therefore there would be no performance boost. Thanks, thats what I needed to know.

Trader

Lol Tim, what the heck are you doing here. Don't have time to email me from fiji but you can stalk me on the forums . And I think the word you are looking for is traitor .