So what can the buyer expect from the front side bus speed increase from 333 MHz to 400 MHz? With the processor overclocked to 4 GHz using each of the FSB speeds, the faster FSB only showed a performance improvement of a meagre 0.5% – on average! The front side bus apparently has a negligible influence on performance, even at these high clock speeds. The performance delta measured here is so small that they may just as well be due to margin of error and fluctuating benchmark results.
The clear answer to our question is therefore, that the FSB speed increase does not translate into any kind of performance advantage for the end user.