Yeah, you need a VIA mobo, (can't be done on nForce2s).
'PowerNow' feature allows voltage and multiplier changes in order to preserve battery life.
So if you have motherboard/chipset/BIOS support for PowerNow which not all boards do, nForce2 does not, you can use this feature on locked desktop CPUs.
You also need to boot into Windows with your locked multiplier and the FSB with which you can boot into Windows but you cannot change the FSB inside Windows, only the multiplier. Ironically, you can change the FSB too inside Windows with nForce2s but they have no PowerNow feature so it's of no use with super locked chips.
So with this so called super unlock method, remembering that MHz Speed = [FSB] x multiplier
FSB can be changed only before you boot into Windows but
multiplier can only be changed after you boot into Windows.
...with limited success so far.
It's not a real unlock at all.