Unlock Phenom II x2 550BE on Gigabyte GA-MA785GM-US2H?

By Jawshh
Nov 8, 2011
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  1. Hi,

    I have been looking forward to purchasing a 4-core cpu to replace my phenom II X2 550 that i've had for like 2 years lately but I decided to try to unlock it and maybe I could save some bucks. My CPU-Z screen is in the attachments.

    Basically, I have a Gigabyte GA-MA785G-US2H revision 1.1 mobo with F11 bios. My cpu is Phenom II X2 550 Black edition codenamed Callisto. According to wikipedia, Callisto archs have 2 cores locked, so, unlockable maybe!?

    So, I changed ACC to auto and EC firmware to Hybrid, saved settings and rebooted. Surprisingly, the machine booted fine! However, when I check on CPU-Z, nothing's changed! It's still Phenom II X2 with 2 cores and 2 threads! I checked in msconfig as well and there are only 2 cores!

    Can't say that the machine is really stable though! It IS stable, but not like when ACC is disabled!

    Because the machine booted fine, I assume that the dormant cores aren't really faulty right? Or, are they?

    Is there something more I need to do to have those cores unlocked?

    Attached Files:

  2. fimbles

    fimbles TechSpot Evangelist Posts: 1,232   +119

    Sounds like you did everything right..... strange..

    Have you tried setting acc to all cores?
  3. Jawshh

    Jawshh TechSpot Enthusiast Topic Starter Posts: 438

    Did that alright but I gave up on that after a couple of tries. I'm replacing the CPU with a Phenom II X6.


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