Using two different GPUs in a Mac Pro (4,1)

Hi, so I've been Google'ing, and I've thus far been unable to find any hint whatsoever to my (somewhat difficult-to-understand) question.
So here it is:
I'm planning to purchase a Radeon 5870 to upgrade from my dated nVidia GT 120 GPU. However, there's a catch. The 5870 is not the Mac edition, and I do not want to buy a Mac edition card as it's unreasonably expensive, considering how old the card is (2009). I know there's a way to flash a Mac-compatible BIOS onto the card, but it seems unsafe and I don't feel comfortable doing something like that. So is it possible to use my GT 120 to strictly handle the graphics from the Boot Camp/boot screen GUI (as PC cards can't display those things to my knowledge) and use my Radeon 5870 card to process all of the graphics, etc. after the system has booted? Would I have to change the cable (DVI) from the GT 120 to the HD 5870? And if that's the case, are there any specific steps that I have to do? as in go into the settings panel or something?
Thanks in advance,
NinjaBanana0911

I only rarely needed to see the boot screen. The default OS you want to boot from can be set in Windows or Mac OS X, and "X" on startup will bring up Mac OS X.
run Windows on its own drive. Slide Mac OS drive out, it has to boot Windows.
So yes I have run Windows and Windows only at times, with a pure PC card, no boot screen.
Only during install or if you HAD to use Option key, as even Recovery Mode can be done from keyboard.
As for drivers, yes there are a few Apple drivers but the only one you might need had to do with power management and good ole Boot Camp control panel to change the startup disk setting.
Not only would I not put Windows on same boot drive I would also clone both systems with respective tools so you have a good working - bootable! - clone of each. CCC for Mac, and Paragon's Clone OS or their HardDisk Manager Suite 2014.

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