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Unlocking AMD Phenom II X2 555 to B65 with this build

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It seems that the Phenom II x2 555 can be unlocked to a Phenom II x4 B65 processor 
the vid: 

 

I have this set-up: 

Motherboard: Biostar A780L 
Processor: AMD Sempron 140 unlocked to Athlon II x2 440 
Graphix Card: AMD Radeon HD 1GB 6750 
RAM: 2GB DDR2 
A generic 600W Power supply which I want to replace with a branded FSP Hexa 520W 


Here is what is shown in cpu-z based on my PC: http://s8.postimage.org/6u4ypgk91/Untitled.png 

Originally, I am planning to buy a Phenom II x4 955. But I found out that it has been phased out for almost a year now. All I have found so far are Athlon x2 dual cores. I can't believe it. 


Right now, I have a Sempron unlocked to Athlon II x2 440. So, I though that unlocking Phenom II x2 555 to Phenom II x4 B65 is possible for my mobo provided with the PSU. But I want to hear from you guys especially about safety measures. I am a newbie here but I am aware of the possible consequences that I can face after unlocking. The unlocking of Athlon II x2 440 came from just a video turorial. I hope you understand. 

If it's not really recommended to unlock it, will the Phenom II x2 555 alone will suffice for playing AC3? I am also staggering for the low fps issue.

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When it comes to unlocking AMD cpu's that have had cores disabled, it is really just pot luck!  Some unlock and are stable, some do not.  If I was in your situation, I would probably just go ahead and buy an AMD X4 955, you can pick one up used for under $80, which isn't much more than a x2 555 would prob go for.  That way you have a guaranteed 4 cores, plus much more OC potential...if you are into OCing that is!

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I agree with what Speedway said, the only thing I would add is that often on later x2s, they began laser cutting cores, making it physically impossible to unlock them, so it really is just luck

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The probelem about x4 955 is that I cannot find one from the stores I have went to. I didn't know that i'ts just pure luck when it comes to unlocking. 
Do you think the motherboard will not get in the way about watts? 

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Having had a phenom2 550 for a long time I can say this, I had it unlocked on a gigabyte board with no problems, except for losing my cpu temp hardware it ran and oc'ed great, when I upgraded I put the same cpu in my wife's Biostar mb to replace her semperon, no way would that board unlock the cpu, not even to 3 cores, needless to say I know it wasn't the cpu. I hope you have better luck with your mb. :(

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Wait, people are still using 955s? I've had mine for years, I thought it would be badly outdated by now.

That's like saying a Q6600 is badly outdated.

 

Sure they aren't top of the line, but they are perfectly acceptable for a mid-range gaming build.

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Wait, people are still using 955s? I've had mine for years, I thought it would be badly outdated by now.

There are still lots of them out there and still running great, it's too bad amd retired that line,  a used one is still a good buy. :)

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