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Gigabyte GA770 will not post after trying to unlock Phenom X3's fourth core

post #1 of 11
Thread Starter 
After setting the mode to hybrid and ACC to auto, upon saving and exiting bios, the system will not post. System worked completely fine before attempting to unlock the fourth core, so RAM isnt the problem. BIOS will not even show up, and keyboard is completely dead. Fans turn on and there is some HDD activity, and the Ethernet plug lights up, but thats about it. Did I just fry my CPU?

Mobo GA770
2x2gb ADATA RAM
Phenom II X3 720
post #2 of 11
No you didn't fry your CPU. Just clear the CMOS, then you should be able to boot. Then you can give it a little more CPU voltage and try to unlock it again. If it doesn't work after this I would say the 4th core is defective. Keep in mind not every single chip unlocks, it is a gamble.
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post #3 of 11
Try resetting the bios by removing the battery on the mobo for at least 30 seconds
    
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post #4 of 11
Reset CMOS and viola
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post #5 of 11
There are reasons why AMD disables cores. Your 4th core might be...wait for it...defective!
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post #6 of 11
Why does AMD dissable cores in the first place? i never understood that..
    
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post #7 of 11
Thread Starter 
Thanks for helping a newb out. Had read some horror stories about similar situations resulting in RMA'ed CPUs so just figured I'd double check
post #8 of 11
Quote:
Originally Posted by iCrap View Post
Why does AMD dissable cores in the first place? i never understood that..
two reasons, either the core is defective, or they have more x4 chips then they needed and locked a core to sell it as an x3.

By locking down defective cores, you increase your yield greatly, because you can sell chips that are only partially defective.
post #9 of 11
Quote:
Originally Posted by iCrap View Post
Why does AMD dissable cores in the first place? i never understood that..
they sell duals that are actually unstable quads. same with the tri cores. so they disable the unstable cores and sell em
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post #10 of 11
So they just make one Quad Core CPU, and if it has a problem they sell it as a cheaper dual or tri core? I read somewhere that Intel does this too, with the Core 3/5/7 series?
    
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