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AMD Phenom II X3 710 - 4th Core Unlock (HELP)

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Last response: in Off-Topic / General Discussion
December 4, 2009 5:21:59 PM

I built a new machine using an AMD Phenom II X3 710 triple-core processor. I also purchased the Biostar T-Series board that is able to unlock the 4th core using AAC. However, when I set AAC to Auto or All Cores, I still only get 3 cores in Windows. Currently, I have it on 3 cores, overclocked from 2.6GHz to 3.2GHz, which isn't really a problem. I just want to get this 4th core unlocked to see if it's stable.

My question is: Which BIOS version for the board do I need to unlock the 4th core? I was reading about how AMD released a statement to all AMD board companies to prevent 4th core unlocking in more recent BIOS' something tells me I need an older version. Just hoping someone can pinpoint exactly what it is that I need.

Windows 7 Home Premium 64-bit
AMD Phenom II X3 710
Biostar TForce TA790GX A3+ (


More about : amd phenom 710 4th core unlock

a b K Overclocking
December 4, 2009 8:38:00 PM

Go to the "T Series" Menu , then to "CPU Tuning"

Find "Advanced Clock Calibration" And Set To "All Cores" (If It Doesnt Work , Try Auto As Well)

Find "Core Levelling" And Set To "Enable All Cores"

You Should Now Have All 4 Cored Detected

Make sure you have the most updated BIOS.... hope this helps...
December 4, 2009 8:39:48 PM

Thanks for the reply.

I've done both of those, however, as I mentioned, I still do not see the 4th core. I think my BIOS needs changed, but I'm not sure which version I need to go to. Can you help? Or, if you have the same board, tell me the version you're using?

Thanks again.
Related resources
December 5, 2009 1:18:54 PM

Thanks a lot.

I'll give it a go when I get home this afternoon. Is there anything in particular I need to do when using the Winflash utility? I am running Windows 7 Home Premium 64-bit with UAC enabled. Just trying to be cautious.. I don't want to destroy my board, haha.

EDIT: Oh, sorry. There are two updates listed on that page. Which one do I get?

Also, is there anywhere I can get a guide on how to properly overclock my CPU? I just put it on automated overclock for V12 tech engine and it gave me 3.2GHz per core. I was wondering if there was another way to get more processing power out of it.
February 15, 2014 12:35:58 AM

Same is the case with me. The CPU unlocks but windows doesn't show the fourth core. It's only when I install and run PCwizard that I find there's a 4th core running at 0Hz. No BIOS versions or overvoltages could give me a working 4th core.
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