all intel chips are locked no mater what and i think AMD is locking theres too expect that you can take them down(OH JOY!) there latest core codenamed brisbane has there multiplier locked
despite that you can get there "slowest" brisbane from 1.9GHz to 3.1Ghz by just uping the FSB i have mine at 2.5 but my mobo isnt very good so it runs into statiblity issues when you get too much higher(im lower the HT level FYI)