A thorton is basically a castrated barton core, it has half the cache that barton does. I know that Athlon XP's with the palomino and throughbred cores can be unlocked pretty easily but ive heard that a barton or thorton is more difficult. By unlocked i mean unlocked so you can use it in a dual CPU setup, you see with a simple pencil mod on one of the pamolinos the smp capabilities could be unlocked, same with the multiplier and possibly power saving enhancements.
Google modding a barton and unlocking a barton. Try thorton as well, it may be a different procedure but i think itll be the same since they are the same core basically.
BTW are you sure its "Thorton"?? and not "Throughbred"?? I dont think they made 2200+ thortons....