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AMD Phenom II X555 BE, Core unlocked is unstable

Last response: in CPUs
June 22, 2012 11:41:13 AM

Hello, here is my build
CPU: AMD Phenom II X2 Black Edition 555 3.2 GHZ 6MB L3
Cooler: Aftermarket Ultra silnt cooler
Motherboard: Gigabyte GA-MA785GMT-UD2H (2 PCI, 1 PCI-E x1, 1 PCI-E x16, 4 DDR3 DIMM, Audio, Video, Gigabit LAN, IEEE-1394)
Ram: 2X2GB Gskill 1600 MHZ
HDD: 950 GB (200 GB +750 GB)
Video: ATI 4850 512 MB ყუთით
PSU: Rosewill 630w 12V 50a 730w peak power. 80Plus Active PFC

I unlocked other 2 cores, and it showed my that my build was now Phenom X4 B55, but the system is unstable, when the windows loads , the screen lights up and down, wasnt able to run Prime , the system didnt let it run. I ve changed some voltages and there are numbers next to cores from -12 to +12. I tried almost everything i knew and my friends also helped me, but i couldnt make it stable, My one friend said that core unlock isnt stable at SB710 Chipset , it needs al least SB750, if there is anybody who can help me , i ll be very glad, thanks
June 22, 2012 1:58:52 PM

as stated often by many review websites, unlocking core has a very slim chance to unlock fully-stable cores. so you might be one of the large majority unlucky unlocker :p  .

i dont know much about southbridge being a factor, however it should be noted that unlocking cores also increases the CPU's TDP. your best bet for now is to unlock just one core and makes it x3
June 22, 2012 2:49:16 PM

I ve made it X3 but again it isnt stable, so it means I m unlucky :D 
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June 22, 2012 4:40:10 PM

beqa11 said:
I ve made it X3 but again it isnt stable, so it means I m unlucky :D 

well do u have a option to select which one of the 2 disabled cores is enabled?? if so, try the reverse combination, disable the current enabled locked core, and unlock the other one.....see what happens:) 
Getting a deneb with 2 bad cores at this point of time is really bad luck :D  IIRC AMD had really good 45nm yields towards the end with the C3 stepping...

Btw is it stable if u drop down the freq....say to around 2.8Ghz or lower??
June 24, 2012 6:52:45 AM

I ve tried that also, but its unstable again
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June 24, 2012 8:03:53 AM

beqa11 said:
I ve tried that also, but its unstable again

Then my friend u have very bad luck :( 
Anyway u got what u paid for, which is an X2, crank up the clock on those 2 cores as high as u feel is safe:)  Better luck next time :D 
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June 24, 2012 8:05:22 AM

Those are the reasons why AMD locked them.