AMD Phenom 555 unlocking problem

Hello.When I try to unlock cores, Windows 7 sometimes boots, but sometimes it doesn't. When it boots its perfectly stable.
Should I change anything more in BIOS/Windows ? and what is the maximum stable voltage for the 555?
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More about phenom unlocking problem
  1. The X2's have locked cores for a reason. Sometimes they are stable, sometimes they are faulty.

    Try unlocking only one of the two locked cores to see if you can at least get a stable X3. If not, you are out of luck.
  2. Please visit an overclocking/unlocking guide. hopefully 1 written for your specific motherboard.
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