IIRC none of the dual cores could be unlocked. Some single core Semprons could be unlocked to two cores (iirc), tons of X3's could be unlocked to either just four cores or four cores + level 3 cache.
Typemachine: Acer Aspire One D250 | Atom N280 1.6 Ghz | 1GB DDR2 | 160GB SATA | 10.1' 1024 x 600 | Lubuntu 12.10
Oldbox: HP D530 | Pentium 4 2.8 Ghz | 1GB DDR | 40GB | Windows XP
"The 'gentle biker' look is overdone. I'm going for 'psycho hillbilly.' "