All CPU Cores Opened, Computer Shuts Off?

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thy_brandon

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I recently opened all the cores on my CPU just messing around with my computer since it's a older computer, and I've noticed when I play CS:GO after awhile the computer just randomly shut off, then I tried shutting off extra 2 cores, and no crash at all so I'm guessing it is a core issue is there somehow I can fix this because the game runs much smoother with all 4 open, maybe lower the graphics ingame?..

my specs

nvidia geforce 640 gt 2gb
8GB 1333mhz
amd phenom ii x2 555 to AMD Phenom II X4 B55 when all cores opened
windows 7 64 bit
ultra lsp 750 powersupply
asus m4n75td motherboard

Like i said it's a older build from awhile back but I was just wondering why it's shutting off when I turn the other 2 cores on.

Thanks with any information.

B.
 
Solution
techgeek
I can certainly understand not wanting to invest any more money in an old rig. You might be able to get away without it, but I would keep an eye on your thermals. Take a base line sample by running Prime 95 with only two cores enabled. This will tell you the best case scenario and how much room you have to work with. Then enable all the cores, test for stability with say Prime 95 and monitor your temperature. If you run into instability, and if you have room left thermal wise, bump Vcore. Of course it goes without saying that if your still unstable and getting too hot, it's not going to work with the stock heatsink. However as I mentioned with my son's 550, I was able to get one good working core for a triple cripple. With only...
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getochkn

getochkn

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No, the reason they shut off those two cores at the factory and made it a x2 instead of an x4 is because they cores were defective when they tested it. That's how they make chips, they make a batch and then test them. Ones that fail a certain number of cores or clock speeds, are reduced down until they run properly and then are locked and sold as that. Just because you can enable the cores, it doesn't mean they work.
 
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techgeek

techgeek

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Not all is lost though. It may be possible to get 1 or more of those cores stable if you up Vcore a little. There is no gaurantee though, it's really luck of the draw. My son had a Phenom II 550 and we could only unlock one core, if I tried both, the computer wouldn't POST. Since you only seem to be partially unstable, it is very likely that some additional voltage will help stabilize your system.
 
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thy_brandon

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I've played other games like Guildwars 2, league of legends and my younger brother plays minecraft at times never had a issue with those games, and i'll try out what you said techgeek and see what happens, so i'm just going to add additional voltage and that's it? and see if that works

my Processor Voltage is on Auto so i'm not sure what to put my voltage at min = 0.8000v | Max = By CPU | Interval = 0.0125v | would you have any suggestions what to put the voltage at?
 
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techgeek

techgeek

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With it at auto, its hard to say what VID is for your system under load. I would download CPU-Z or HWMonitor and look at the voltage. Then run something like Prime 95 and load all 4 cores and see what your voltage goes to in CPU-Z. This will be your starting point. You could even try to run CS:GO and have HWMonitor running in the background and Alt-Tab out after a short while and see what HWMonitor has for a Max read on Vcore.

Once you have your starting point, go into the BIOS run Manual on Vcore and bump it up one notch from the starting point. Save your changes, boot into Windows and test with CS:GO. If that's not stable try bumping it up another notch.

Of course it goes without saying that you should be using an aftermarket heatsink. The stock heatsink isn't going to cut it. Just running all four cores is going to make your CPU hotter without adding voltage. I guess I should have asked what your thermals were like. What are you seeing for a max temperature loaded? Do you have an aftermarket heatsink?
 
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thy_brandon

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I only got the thermal paste and the stock fan that it came with and i got cpu-z and with 2 cores it's saying 1.024volts without anything going i'll try to load cs:go later and see what it is with CS:GO going.
 
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techgeek

techgeek

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I would say if you really want a shot at this working, you should get an aftermarket heatsink. Just adding two more cores is going to make your system hotter, and that's without adding more voltage. The stock heatsink is the same one used by the quad core Phenom II's if I'm not mistaken. So they will handle the heat output of a quad core, but that's at a lower voltage than you'll end up using.

If you're interested in going this route, the Hyper 212 EVO is the best bang for the buck heatsink out there. Also doesn't hurt to have some addition thermal paste at hand.
 
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thy_brandon

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since' it's a older rig computer i'm not going to invest money into it i got 2 other fans that in my computer that i put in myself, so i'm not sure if that would keep it cool enough, and i currently just cleaned this computer out last week so it has brand new thermal paste in it. so i'm not sure what to do.

 
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bmacsys

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A lot of times only one core is defective. I enable one core at a time and reboot till I find the defective core. You may get a good, working X3 out of it. I have two 960T's that had one bad core. They are fine as five core.
 
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techgeek

techgeek

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Apr 11, 2004
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I can certainly understand not wanting to invest any more money in an old rig. You might be able to get away without it, but I would keep an eye on your thermals. Take a base line sample by running Prime 95 with only two cores enabled. This will tell you the best case scenario and how much room you have to work with. Then enable all the cores, test for stability with say Prime 95 and monitor your temperature. If you run into instability, and if you have room left thermal wise, bump Vcore. Of course it goes without saying that if your still unstable and getting too hot, it's not going to work with the stock heatsink. However as I mentioned with my son's 550, I was able to get one good working core for a triple cripple. With only enabling one core, it won't push the temperatures up as high. Of course the same testing would apply.
 
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thy_brandon

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Alright thankyou for all your time and effort and information you provided I really appreciate it :D.

 
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