Overclocked PCIe bus boosts 9600 GT Performance
@ 2008/03/02On "normal" VGA cards, when you increase the PCI-Express bus frequency you increase the theoretical bandwidth available between card and the rest of the system, but do not affect the speed the card is running at. On the GeForce 9600 GT, a 10% increase in PCI-Express frequency will make the card's core clock run 10% faster!
For normal cards overclocking the PCIe bus does nothing as far as performance goes.