Can I run Radeon 4870 + GeForce 120 simultaneously

What seems like a pretty obvious question is one I can't find answered on the web.
I just ordered a Mac Pro with GeForce 120 as standard, and I also ordered a Radeon 4870 to install in it.
I'll put the radeon in the main slot and move the geforce into the 2nd slot.
Can I do this? Will both cards operate and allow desktop spanning etc?
Also, will the colour reproduction be the same across both screens? I will be running 2 x 24" LED displays.
Thanks in advance.
Scott

Wouldn't it be better to connect one to each card, therefore giving 512MB of RAM to each screen, rather than splitting the 512MB of one card amongst two screens?
The VRAM may be better utilized with two cards and two displays, but unlike Crossfire or SLI, you will not get the combined processing power of the two cards.
Many applications won't benefit at all from two layers of VRAM.
You will, in fact, be rendering all graphics with one card, with that card then passing the information onto the second card.
The VRAM on the primary card, as well as the GPU, are still going to be working as if two displays were connected to it.
What would cause a hit in performance?
In all practicality, Yes.
What all this means, in reality, is higher latency on the PCI bus while passing graphics from one card to the other, without any gains in processing from the second card.
In a dual display/dual card setup, this means one may actually lose performance as opposed to two monitors on a single card.
In a three monitor setup, well, these issues become moot out of necessity for additional display ports.
And to reiterate what Malcolm said, some applications may actually have trouble with dual card setups.
FCP is one known to have issues.

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