I have the ATI x1900 installed in slot 1 and the Nvidia in slot 4 and have successfully booted into OSX and have all 3 monitors displaying. I have 2 20" Dell 2001FPs and 1 30" Dell 3007fpw. One 20" and the 30" are connected to the ATI card with the 30" in landscape and the 20" rotated to portrait mode. Unfortunately in OSX Nvidia will not allow me to rotate the second 20" into portrait mode. I could attach both 20" sceens to the ATI card and successfully rotate them to portrait but I cannot get the NVIDIA card to show anything when I boot into XP via bootcamp. So I'm either stuck with this problem unless some can help me to get XP to recognize the Nvidia 7300 and diplay both the ATI and Nvidia together or am stuck with being unable to rotate my 20" 2001FP into portrait mode attached to the Nvidia card in OSX. Any ideas?