You can increase your Asus P5ND2-SLI Deluxe board's system performance with the AiBooster utility, bundled in the software package. The default FSB for the Pentium 4 3.73Ghz Extreme Edition is 1066Mhz.

The maximum overclocking we managed to achieve was up to 4.28Ghz with FSB running at 1220Mhz. We tried both with AiBooster and through the BIOS. At higher speeds, we had blue screens or the system failed to boot.