Dual graphics cards and os

[sackflaps]

Hello all, i am a real newb to all of this so bear with me. I am running a dual boot system with Xp and jas 10.4.8. My main graphics card is a Nvidia geforce 8600 gts which isn't supported by OSX. I also have a nvidia 7300 which works perfectly with jas, but the only way to boot OSX is to physically remove the 7300 from the motherboard. Is there any way to assign the 8600 to Windows and the 7300 to OSX.

 

Thanks.