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Message: <blockquote data-quote="ibnanv" data-source="post: 7041134" data-attributes="member: 218596">AMD PHENOM II CORE UNLOCKING GUIDE**As of 12/11/09, some Athlon II processors also apply.IntroductionCore unlocking of AMD chips has been a very hot topic of discussion. The  possibility of spending a mere $100 dollars for a Phenom II X2/X3 chip  and unlocking the disabled cores to yield a $200 dollar X4 chip is  exactly like the goal of every overclocker around - spend the least  amount of money possible and get the most bang for your buck. I have  written this guide to consolidate the information surrounding core  unlocking, and to answer any questions you guys might have.Remember, core unlocking is NOT GUARANTEED.  However, the aim of this guide is to help everyone increase their  chances of successful unlocks.DISCLAIMER: I am no means an expert. I’m just extremely interested in  the subject. My experience is limited to the X2 550BE and the X3 720BE.  As a result, for the gurus out there, I welcome you to chime in and  correct me. I will keep this post updated with new information and  corrections. BackgroundThe current Phenom II architecture is very unique, and is AMD’s answer  to Intel’s Core2Duo and Core2Quad series. Unlike the Core2Quad, which is  essentially two Core2Duo’s bridged together, AMD’s Phenom II is a chip  with four individual cores. Like all manufacturing processes, chip fabrication is no different.  There are always parts which don’t make the quality cut. In the case of  the Phenom II Quad cores, these parts may have defective cores or cache.  Rather than throwing these defective Quad cores out, AMD decided to  repackage these chips as Dual cores or Tri core processors. It was a  win-win scenario for AMD. They would sell these processors at a cheaper  price to recover costs and also minimize wasted parts.When the Phenom II X3 720BE was released, it was highly popular among  mainstream enthusiasts. Like all BE processors, the 720BE had an  unlocked multiplier, which made overclocking it an extremely simple  process. Furthermore, it was priced competitively against Intel’s  Core2Duo E6xxx series, but performance actually rivaled the E8xxx  series. Why would you pay Intel for a Dual core when you can get a Tri  core from AMD?However, the surge in demand for 720BE processors started when a Korean  overclocker first discovered that the “defective” core could be  unlocked. He used a motherboard with a SB750 southbridge which supported  Advanced Clock Calibration (ACC): the Biostar TA790GX. Soon after,  others reported similar success in unlocking the 720BE. This phenomenon  eventually extended to include X3 710 and X2 550BE processors as well. <a href="http://www.theinquirer.net/inquirer/news/1051180/amd-reports-improved-phenom-ii-x3-cpus-sales" target="_blank">Unoffically</a>, AMD reported record sales of X3  processors, no doubt, in part due to fourth core unlocking. Many  believe that the increasing rates of successful unlocks is due to AMD  purposedly binning perfectly working X4s as X3s to sastify market  demands. What does this mean for you? Your chances of getting an  unlockable X3 chip just got better.Quick overview of parts needed<ol> <li data-xf-list-type="ol">AMD Phenom II processors –  Codename Heka (Tri-cores) or Callisto (Dual-cores). **As of 12/11/09, some Athlon II processors DO APPLY.</li> <li data-xf-list-type="ol">Motherboard with ACC support (SB710 or SB750 southbridge) or NCC  (Nvidia’s answer to ACC) AND supports core unlocking. More on specific  boards and manufacturers later.</li> <li data-xf-list-type="ol">A little bit of luck</li> </ol>Choosing the right processorAs previously mentioned, all of AMD’s Phenom II processors contain four  cores. X2 processors are X4 processors with two disabled cores, and X3  processors are X4 processors with one disabled core. There is a  possibility of unlocking those disabled cores using ACC and the right  motherboard.Choose your CPU from the following models. Even if you don’t end up  unlocking the 4th core by following this guide, you can’t go wrong  because you still would have gotten the best bang for your buck. These  chips are proven overclockers. <ol style="text-align: center"> <li data-xf-list-type="ol">AMD Phenom  II X2 550BE</li> <li data-xf-list-type="ol">AMD Phenom II X3 720BE</li> </ol>the main link <a href="http://www.overclock.net/amd-cpus/535501-amd-phenom-ii-core-unlocking-guide.html" target="_blank">http://www.overclock.net/amd-cpus/535501-amd-phenom-ii-core-unlocking-guide.html</a></blockquote>

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