it originally has 4 cores, but AMD locked 2 cores. Overclocking it unlocks those 2 cores (if overclocked properly)Often times the cores are locked because they're bad.
If you do want to add the 'unlocking' part as a selling point do some research first and find out if you actually CAN unlock it safely, or provide the necessary information for others to do so.
http://www.tomshardware.com/reviews/unlock...om-ii,2273.html
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Every so often, a story breaks that goes a little something like this: manufacturer x, known for its flagship product y, recently started offering a mid-range product z based on silicon that wouldn’t bin up to y. Rather than throw the entire die out, x disables one part and sells it off as z—something less expensive.
Much of the time—it’d be disingenuous of me to guess how often, exactly—
this happens because part of the die is really defective. But sometimes a vendor simply needs to fill in a price gap in its lineup where a competitor is eating its lunch. ATI’s Radeon HD 4830. Nvidia’s GeForce GTX 260. AMD’s Phenom II X3 700- and 800-series. These are all parts based on more expensive components
http://en.wikipedia.org/wiki/Phenom_II
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Beginning with the AM3 versions, Phenom II CPUs are based on two dies: the original Deneb die with four cores and the new Thuban die with six. These are divided into five series for marketing. The first two series are flagships based on full dies. The other three series are formed from Deneb dies by die harvesting, that is, chips that were produced with some amount of defects. The affected portions of these chips are disabled and the chips themselves marked as a lower-grade product.[1]
QUOTE
Some versions of the Phenom II X2 and X3, however, have no defects in the silicon but one or two cores "deactivated" to enable AMD to target the lower end of its market.[12] As a result, with the correct motherboard and BIOS it is possible to unlock the deactivated core(s) of the processor. However, success is not guaranteed, because in some cases the core(s) may have been deactivated due to faulty silicon. Hardware enthusiast websites have collected and summarized anecdotal reports that, overall, indicate about a 70% success rate,[13] but these reports likely have self-reporting bias, and more importantly, it is impossible to know whether an unlocked core is truly bug-free or just works "well enough" for the particular individual making the report.[original research?]