Can't unlock Phenom II X3 720 to X4 anymore?

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Espionage724

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I used to be able to unlock my X3 to a X4 easily on my Biostar A880G+ motherboard (just as simple as enabling ACC and having it on auto).

Now when I try to enable it, it sometimes works, sometimes it doesn't. When it does work, it usually only turns on after 1 boot whereas the next boot will leave me unable to POST until I restart the computer twice (afterwards, BIOS says that ACC has failed).

Is it possible I damaged my CPU in some way recently? Recently I ran my CPU at 1.5V and 1.55V but this was only for a day, and it was with X3 I believe, and I also ran at these voltages in the past too for a short period of time.

I'm just confused as to why ACC would unlock it once, and then fail next boot, even if no settings in BIOS are changed...
 

silverliquicity

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I wouldn't normally recommend a BIOS update but in this case i would. that's a bit of a strange problem.

Il do some research as im interested myself and il post back.
 

silverliquicity

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I wouldn't normally recommend a BIOS update but in this case i would. that's a bit of a strange problem.

Il do some research as im interested myself and il post back.
 

Espionage724

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it's worked fine though since July last year without any problems. All of a sudden now though it's giving me problems :/
 

Motopsychojdn

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I agree with Rolli here,
my x3 435 unlocks fine (old rig,still own though), used to hold a 3.5GHz overclock and slowly over time frazzled, only takes 3.2GHz now,
you are probably onto something with the voltages being a possible cause as well
Moto
 

newt183

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This is rather strange... i would do what silverliquicity suggested and upgrade your bios version. If that doesn't work, then its your cpu.
 

Espionage724

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I'll try a BIOS update a little bit later. I did reset CMOS though, but that didn't make a difference

I tried setting a lower clock speed and voltage on the CPU as well prior to trying to unlock, and it would still fail
 

Espionage724

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Just did a BIOS update.. and it appears I can unlock properly now :D, I can reboot and still be in X4 too :) And I have a cool looking BIOS screen now
 

Espionage724

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Hmm, so it turns out it wasn't actually the BIOS update. After rebooting after changing every setting, I found out it was the settings I was using on the HyperTransport.

By default, it was on Auto for both speed and link width. If I try setting it at 2.0Ghz and x16 (which I thought it defaulted to anyway), I can sometimes boot, but if I shut down, I can't reboot without having ACC fail.
 
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