Whoa, whoa, whoa, wtf? How do you "unlock" another core on a CPU? I've never even heard of this being done before, can someone explain?
On AMD CPUs, they sometimes lock off cores. The CPUs that they make are all quad core, however some chips fall below AMD standards. Usually that "bad" chip only is slightly warmer when running, isn't quite as efficient, maybe isn't quite as fast, things which aren't detremental to the core, but are below AMDs standards basically. If you get one like that, you can unlock the locked cores and they will work fine. Ofcourse some will be too far gone and cause hanging, bsods, stop the system from posting etc.
they also lock of cores for demand.
Say they made 1000 CPUs, that is 1000 quad cores. If from that 200 ordered are dual core, 300 tri and 500 quad, they will shut off the perfectly good cores for the dual and tri core CPUs, so you can unlock it and get the exact equivalent to the quad core equivalent.
However you also need a motherboard that has ACC (Advanced Clock Calibration) so you can unlock the cores through the bios. Can't remember the exact south bridge that you need (if strangehold comes back here, he will probably tell you), but it is certain SBs that have it