<sarcasm>Hey, my BIOS for my Pentium 4 system has a multiplier setting that can be modified as well. I guess that means my Pentium 4 is multiplier unlocked!</sarcasm>I'm afraid you were wrong, our school comp room has P3 450s, and when inspecting the BIOS, the main menu had a CPU Clock Speed option (wow how obvious) where you can easily overclock it. There you can augment the multiplier IIRC, not the bus though.
The ability to change the multiplier in the BIOS has always been present. However, it does absolutely nothing when used on a processor with a locked multiplier.
-Raystonn
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