Geforce 8800 just for Windows

I use my Mac for video work, but I'm also an avid PC gamer. Since the Mac has excellent hardware, except for the latest Direct X 10 video cards, I was wondering if I could install a Geforce 8800 card in an additional PCI-X slot. I'm fine with using my current Mac video card for my work, but I was wondering if I could get my Mac to "ignore" the Geforce 8800 in OS X, and when I install Windows via Boot Camp if I could just use the Geforce 8800 as my primary video card and play games. I don't mind some cable switching or using a video switcher to make this happen. But will my Mac be OK just having this extra card sitting around inside?
I know Boot Camp is still in Beta, I was just wondering if anyone had tried this out.
2.66 Ghz Quad Xeon, 2 GB RAM, 250 GB HD   Mac OS X (10.4.9)  

Thanks for the quick answers - since I would have only one 16 lane slot, could I place the geforce 8800 in slot #1 (double-wide) and put my standard card in another slot? Is the Mac looking for the primary OSX video card to be in slot 1? I know you can adjust the lanes for the different slots through some utility. I would plan on moving my Mac card first, making sure I could boot, install Boot Camp and Windows, and then install the 8800. I feel like that should work.
And I totally understand your suggestion of waiting - like many other users, I'm hoping for an ATI/AMD R600 upgrade option, but I feel like it may just get pushed back more, or might not even happen.
2.66 Ghz Quad Xeon, 2 GB RAM, 250 GB HD   Mac OS X (10.4.9)  

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