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ATI’s video processors have a native, or “true” PCI Express interface. They can communicate directly with the PCI Express bus at PCI Express speeds.
Other graphics companies have cards that are compatible with PCI Express, but they are still only AGP cards that are “bridged” by a second chip to be physically compatible with PCI Express slots on the motherboard. This architecture can only work at AGP speeds, and is more vulnerable to failure, performance bottlenecks and incompatibility with software applications."
The Fastest Lane to PCI EXPRESS™ is with ATI
http://www.ati.com/products/PCIexpress/index.html