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Overclock/core unlock problems

post #1 of 15
Thread Starter 
I recently just built my new computer using the ASUS M4A88T-V EVO/USB3 motherboard and the AMD Phenom II x2 555 Callisto Black Edition (3.2ghz).

I've read a lot of reviews of people using this same combo and successfully unlocking the 2 additional cores as well as overclocking up to 4.0ghz.

When I used the ASUS mobo core unlocker, it said 4 cores were unlocked. I started it up and I checked dxdiag and it says AMD Phenom II x4 B55 Deneb 3.5ghz but only 3 CPUs.

I checked prime95 and it also only showed 3 CPUs.

This would be fine, except it seems to be unstable. I tried to shut it down, and it said windows is shutting down and the my monitor turned off but the computer kept on running..

After that, I turned it off and when I tried to turn it on, and it got to the "Windows Starting..." screen but it froze right there, didn't load the windows logo. So I can't start it with 3 cores unless I do it a certain way (I've only managed to get it started 2 times).

So I changed it back to dual core and right now I'm using the standard dual core @ 3.2ghz which is still really good but I would really like to get at least, dual core 4.0ghz, 3 cores at like 3.5ghz - 3.8ghz or quad core at 3.2 - 3.6ghz but I have no idea what to do?

Anybody know if I'm doing something wrong or if I'm not doing something that I need to do? This is the first time I ever put a computer together so I really don't know what I'm doing. Anybody know what I need to do to get 4 cores working? All I did was select core unlocker and start it up and it did the 3 cores but was obviously unstable... is there anything else I need to do?
Edited by cadengrant - 1/28/11 at 2:32pm
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post #2 of 15
Sometimes cores will unlock, but they can be faulty and make the cpu unstable. Theres nothing you can really do, just an unlucky processor.

All you can do is OC it and enjoy it
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post #3 of 15
Unfortunately every cpu is different, apparently only 3 cores are available for yours, and it being unstable is not uncommon. What you may want to try is unlocking the 3rd core but bumping the voltage on it and see if it is stable.
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post #4 of 15
Thread Starter 
Quote:
Originally Posted by appleg33k85 View Post
Unfortunately every cpu is different, apparently only 3 cores are available for yours, and it being unstable is not uncommon. What you may want to try is unlocking the 3rd core but bumping the voltage on it and see if it is stable.
OK cool thanks I'll try that. Are you sure theres no way I can get 4 cores by changing the voltage or something - I have no clue.

When I unlock the cores and go into the bios, it lists the cores like this:

2nd core: on
3rd core: off
4th core: on
5th core: on
6th core: on

What does this mean? Should I mess with any of that?
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post #5 of 15
Just leave it auto so the 3 cores are unlocked but try bumping up ur voltage....i cant tell you how much because you did not full out your rig specs so I don't know what cpu cooler you are using. I'm going out on a limb here and say its an aftermarket cooler in that case...bump the cpu voltage up to 1.4volts and see if that is enough to stablize the 3rd core if not...move to 1.45v...but again full out the rig specs so we can help you out better.
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post #6 of 15
i have same problem with my mobo(dfi lp dk 790fxb-m2rsh) after i unlocked it to 4 cores. it gets unstable, can booting n load windows, cpu-z showed 4 cores too. but the sound in windows became scratchy n videos go unstable/jiggies.

so i set it back in the bios to 2 cores again. any one knows how to make it stable 4cores running...? I need suggestion please... many thanks
    
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post #7 of 15
Maybe they just simply won't unlock.
Keep in mind people, AMD locks the 2 remaining cores for a reason: they may simply be unstable or faulty.
post #8 of 15
Quote:
Originally Posted by xd_1771 View Post
Maybe they just simply won't unlock.
Keep in mind people, AMD locks the 2 remaining cores for a reason: they may simply be unstable or faulty.
This ^^

Your best bet may be to just overclock the two cores that are stable. Mine easily hit 4.0 GHz with very little voltage increase.
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post #9 of 15
Quote:
Originally Posted by Lobsang View Post
any one knows how to make it stable 4cores running...? I need suggestion please... many thanks
Sorry to say but if you needed 4 cores then you should have just purchased a quad core outright. The 555 is really only for people who would be happy with a dual core but "it would be a nice thing" to have 4.

Also, there are basically 2 types of chips you can get. Fully functional chips that have been binned to a lower model because the demand is too great OR chips that have damaged cores so they bin them into lower models and sell them at a lower price.

From wikipedia:

Quote:
Semiconductor manufacturing is an imprecise process, with some estimates as low as 30% for yields.[1] Defects in manufacturing are not always fatal, however. In many cases, it is possible to salvage a part by trading off performance characteristics, such as by reducing its clock frequency or by disabling non-critical parts that are defective. Rather than simply discarding these products, their performance level can be marked down accordingly and sold at a lower price, fulfilling the needs of lower-end market segments.
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post #10 of 15
It really does not matter if you can unlock the 4 cores like i did, i never came across something that needed the 2 extra cores. The chip by it self just overclocked to 4ghz is good enough to run any game, don't think about not getting the cores unlocked, if you wanted a quad you should have bought a quad.

But again a big cooler and lots of voltage may help
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