The Asus P5AD2 (925X) and P5GD2 (915P) mobos offer BIOS capabilities for socket 775 overclocking. THG walks you through Asus' 'CPU Lock Free' BIOS feature that allows boosting FSB speed by unlocking the Pentium 4 Prescott's multiplier. All Asus has really done is to offer a BIOS version that enables the user to manually change processor settings from those that the processor otherwise requires. This way, the processor is literally fooled. As a result, it will only boot at multiplier x14 rather then x17 or x18 for the 3.4 and 3.6 GHz versions.

Asus Bios Unlocks P4 Overclocking Potential