With all Athlon64 boards, the AGP and PCI busses are completely disconnected from overclocking. It appears that to overclock an Athlon64 you either adjust the multiplier (on FX models) or the MEMORY speed (on both models). Since the memory bus is separate from the HyperTransport link to the chipset and therefore the AGP & PCI busses, it has no effect whatsoever on the speed of those busses. The HyperTransport link operates at 800MHz (unless you SLOW it down in bios).