The pci-e version and the agp versions of these cards are completely different. The Pci-e card uses a newer chip with integrated pcie and only 12 pipelines with none disabled so it will never unlock. It's also made using 110nm (i beleive) instead of the original 130nm so it usually clocks up to higher speeds better. The agp version is based on the original 6800 chip and does have 16 pipes with 4 disabled and may be unlockable but is the original 130nm and doesn't over clock as well. The 2 cards are not very simular even tho they share the same name.