Dual Video Cards question

Hi, I have just ordered a new Mac pro with 2 Nvdia GT 120 video cards.
I was wondering does Mac OS and Windows 7 64bit running on Bootcamp make use of both video cards?
The reason I bought the 2 cards option was that I also wanted to play a few windows based games and thought 2 cards would be better than the single ATI video card.
Or is currently the single ATI the best option?
Many Thanks

At this stage I know that a single NVidia video card will be enough for my work using Mac OS so not that bothered about getting the output of both cards whilst using OS.
But would be interested to know if within Windows I can take advantage of both. its not arrived yet so I will guess i will have to see if windows regonises and use both cards. mainly i was trying to save money on not having to buy a seperate pc for games if the bootcamped windows was adequate (want to play FFXIV - online game)
Ran the benchmark for the game on a mac pro 8core using the latest ATi card here at work and that ran very smoothly though only scoring 2100 (1500 seems to be the minimum needed) good pcs score 3-4k. though as it did run smoothly and looked very nice i figured 2 nvdia would improve that even more.
Thanks for your help. I will look into the Nvdia SLI.
Someone also mentioned that i could potentially put in any compatible video card in to the mac to run windows apps. though not sure if the mac would see it.

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    com.apple.iokit.IOStorageFamily          1.8
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    com.apple.iokit.IOPCIFamily          2.7.1
    com.apple.iokit.IOACPIFamily          1.4
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    -rw-rw----@  1 root  admin  7113 Sep 29 01:35 Kernel_2012-09-29-013505_BigMac.panic
    -rw-rw----@  1 root  admin  7109 Sep 29 17:02 Kernel_2012-09-29-170244_BigMac.panic
    -rw-rw----@  1 root  admin  7112 Sep 29 18:01 Kernel_2012-09-29-180106_BigMac.panic
    -rw-rw----@  1 root  admin  7314 Oct  1 12:07 Kernel_2012-10-01-120711_BigMac.panic
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