From Tom's Hardware Guide:
MSI displayed at Computex an ATI X800XT-based graphics card that integrates an AGP as well as a PCI Express interface. The X800XT chip commonly offers native PCI Express support only, but an added AGP bridge on the backside of the board, makes the "RX800 Series / Geminium VIII" an interesting solution for users who want to stick with AGP for now and upgrade to PCI Express sometime in the future.
MSI's card can also be used in a dual-graphics tandem, if users choose to upgrade to an ATI RD400/RD480 motherboard a Radeon X800 master card. (THG)