Depending on the design of the AGP Pro card, you do not have to take up the additional PCI slots. The AGP Pro *standard* allows for wider cards that would take up room over the PCI slots, but a good design would not need the extra space. Generally the extra space is given towards cooling, or perhaps a daughter board. A few good heatsinks and chipset fans would do quite well....a number of people use slot fans to cool their cards, so they lose those PCI slots anyway.