Firstly is the system bus also known as the FSB ? I attended an IT roadshow recently and i was informed that the speed on some of the ASUS mobo's they had there were misleading - they were saying that the FSB runs at 266MHz when in fact it only runs at 133MHz because thats all its capable of at the moment. Only when DDR is plugged in then it effectively runs at 266. How true is this. tx 4 the time..