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02-10-2010, 05:31 AM   #1
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Unlocking PhenomIIx2 555BE

I dont think this is the right forum to post this but thought instead of signing up on some other forum to post this, its better to post here .
If you are following articles from some major technology websites you should already have the information that some of the AMD dual core cpu's can be unlocked & used as quad core cpu's. The main reason behind this is initially quad core cpu's with two faulty cores are used for such dual core products, later on when things get stabilized cpu's with all working cores are shipped with two cores disabled. Unlocking these cores can be easy if your cpu has working four cores.

I purchased AMD PhenomIIx2 555BE two days back with Asus M4A78-EM/1394 motherboard. After a quick check from internet I knew this thing should be able to run all four cores.
Please follow the steps on your own risk.
Here are the steps that I followed:
1. Download the cpuz utility.
2. Check if the Revision of the processor is "RB-C3". Mine is RB-C3 which means latest & has most chances of working.
3. Check for latest BIOS update for the Motherboard, download it.
4. Restart you system & launch the BIOS setup.
5. Go to Advance options>Cpu configuration.
6. There should be setting called ACS, default its disabled set it to hybrid.
7. Below that there should be Unleash mode, set it to enabled.
8. Save & exit BIOS.
9. System will now reboot.
10. On the POST screen message should be displayed all four cores unlocked.

If you dont have the Unleash mode setting, upgrade your BIOS.
I didnt capture screen shots of the process, but now I can only give you screenshot of cpuz with all cores active now the cpu is displayed as B55 instead of 555.
Some people say to disable the CoolnQuiet, but I kept it enabled to save power, its working fine for me
I tested with some raw conversion using all four cores it worked normally without any overheating or crash, temp remained at 54-55C with 100% load on all four cores. SO this is real success, long live AMD

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02-10-2010, 07:29 AM   #2
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Times have changed.
02-10-2010, 07:44 AM   #3
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Ahhh the good old days of unlocking a K6-2

02-10-2010, 09:28 AM   #4
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The Phenom II X2 is nothing more than a Phenom II X4 with two cores disabled. Originally these cores were disabled because of low yields, but over time yields on quad-core Phenom IIs should be high enough to negate the need for a Phenom II X2. This is most likely why AMD removed the Phenom II X2 from its official price list. It's also why the stranger Phenom II derivatives are also absent from AMD's price list. All that's left are Phenom II X4s pretty much.
anandtech has more on this as well
AnandTech: Unlocking the Phenom II X2 555: 3.2GHz Quad-Core for $99


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