Hi there, I have Mac Pro 2009 with NVIDIA GeForce GT 120 512 MB. I would like to buy EVGA GeForce GTX750 Ti. What I read this graphics card should will work. I know that I will lost boot screen. Can I use both graphics cards simultaneously? Or only one of these graphics card can be plugged? I saw some Macs Pro with two graphics cards. Could I also use both cards and would I see the boot screen or it is not possible? Thanks for an advice.