The PCI Express bus type for graphics cards is the standard going forward for all systems and motherboards. In fact, AGP is no longer being supported. If you were to upgrade your system or motherboard now or in the future, you would need a PCI Express graphics card to support that new system, which would improve your overall performance in 3D games and video processing.

BFG would like to encourage you to trade in your current working AGP BFG graphics card for a BFG PCI Express graphics card. The chart below shows BFG AGP cards and their closest PCI Express equivalent. Now, for a limited time, if you send them your BFG AGP card in good, working condition, they will send you the PCI Express equivalent at no cost to you. If you want to upgrade to an even better performing card, there is a nominal fee to do so.

You can read the entire article at BFG's Website.