You can increase your Asus P5N32-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 speed we managed to achieve was 4.28Ghz with the FSB running at 1224Mhz. We tried this both with AiBooster and through the BIOS. At higher speeds, we had the blue screen of death or the system failed to boot.