Overclock is making the CPU run faster than the factory clock. Example factory 3.0 GHz overclock 3.5GHz. Unlocking CPU cores is only possible if the feature is supported on your motherboard. AMD makes some processors with four cores and then disables one to create a Athlon ll x3. Sometimes the last core works when you unlock it giving you a better processor and other times it isn't a stable core and can't be used. The reason some are x3 is because the fourth core didn't work and instead of throwing the CPU away they sell it with the one non working core disabled. I don't believe you can unlock a core on that CPU but that CPU is one of the best for overclocking. You have to increase the multiplier on the motherboard bios. Example 200 * 16 is 3200 or your stock frequency. 200 * 17.5 is 3500 or 3.5GHz. This allows you to take a cheaper CPU and make it as fast as one $50 more (motherboard multipliers go by the .5).