Um, your mobo doesn't have an AGP slot, so how are you going to overclock the AGP bus? Overclockign the AGP bus doesn't really do too much. When you OC via FSB, your PCI & AGP buses are OC'd automatically, depending on the multiplier. If you're on PCI 1/4, with an FSB of 146MHz, your PCI will be at 38MHz, 1/4 of the FSB speed. Same rule applies for AGP.
edit: better cooling is not going to necessarily increase speed, but in turn it will, if you're OCing.
