I have a Mac Pro manufactured on August 07, 2006. It currently has an NVIDIA GeForce 7300 GT, and I would like to add a 2nd video card to support a third 20 inch Cinema Display. I was thinking about getting the ATI 5770, using that as my primary display (23 inch Cinema Display, and then putting the 7300 in the 2nd PCIe slot to power the other 2 20 inch Cinema Displays. Can anyone tell me if this config will work? Will the 7300 be operating at 4x or 8x rather than 16? It is my understanding that there is only one 16x slot. I may use the third Cinema Display as a viewer for NetFlix or Hulu videos. thanks for any suggestions.