AMD Phenom II X2 555 Black Edition CPU presents intriguing tweaking possibilities

by Rafael Hernandez on March 25, 2010 · 0 comments

AMD’s performance line Black Edition processors are best known for their “unlocked” cores that allow for fine-grain tweaking that the overclockers are sure to love…of course there are those that want more out of their processors.

The AMD Phenom II X2 555 Black Edition CPU may just allow for some core unlocking that will push its performance potential even further. ITShootOut has a look:

As with previous Phenom II X2 processors the 555 is not a native dual core. Instead, AMD re-badges Phenom II X4s that don’t quite cut the mustard as X2s with two of the cores disabled. If you have a motherboard with a recent AMD Southbridge a nifty feature called ACC can be used to unlock the latent cores and unleash the chip’s full potential. Using our Gigabyte test motherboard we were able to unlock these cores effortlessly. We enabled the ACC mode in the motherboard BIOS and set the EC type to “Hybrid”. On reboot the chip was detected as a “Phenom II X4 B55” by the motherboard and continued to boot Windows 7 normally. All four cores were correctly detected by the operating system and the chip passed a 24 hour stress test of Prime 95 without error. Obviously not all chips will unlock successfully, but most users are reporting success with the 555 BE. If your chip unlocks but fails to boot the OS successfully, try bumping up the core voltage a little.

An interesting, and cheap, processor that may just meet your performance needs.

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