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Why are my cores shutting down?

post #1 of 9
Thread Starter 
According to Coretemp some of the cores on my CPU shut down during a Prime95 test. I run the test and at first coretemp shows all 6 cores at 100% load. Then after say 30 seconds, some cores start to close down. I know they really are shutting down too, since some of the separate 6 threads that run on Prime95 also shut down...hopefully you know what I mean.

I am fairly sure the cores are OK, since it happens to different cores randomly each time I test it. I've seen between 1 and 4 cores reduce itself from 100% down to 0% during Prime test.

I'm guessing it is not enough voltage somewhere, or maybe too much... but I'm guessing and I'm really not sure. I have a 4.5GHz overclock and the temps are fine and it seems stable.

Has anyone ever come across this?
post #2 of 9
The cores aren't shutting down per say, but Prime95 has detected errors and has killed the thread. If the core doesn't return the proper value, Prime95 indicates that the core isn't stable and there's no further point to continue testing it if it failed. So the voltage needs to be upped or drop your clocks.
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post #3 of 9
You may need more QPI or RAM voltage
    
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post #4 of 9
Quote:
Originally Posted by Dissentience View Post
You may need more QPI or RAM voltage
Probably this, if I mess with the memory too much on a stable OC I'll start getting core errors.
    
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post #5 of 9
Yes those are core errors, indicating insatiability.
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post #6 of 9
Quote:
Originally Posted by H969 View Post
Yes those are core errors, indicating insatiability.
Yeah my favorite cpu is insatiable when it comes to the volts, always wants more to OC higher...
    
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post #7 of 9
Quote:
Originally Posted by FtW 420 View Post
Yeah my favorite cpu is insatiable when it comes to the volts, always wants more to OC higher...
No kidding xD
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post #8 of 9
Thread Starter 
All, thanks for the info... I thought the CPU would BSOD if it wasn't getting enough power, not shut down cores. Everyday is a school day I now wonder how long I have been running it like this.

So this bring with it some new questions. Before I had my Vcore at 1.35 @ 4.5GHz and thought it was stable and running cool, since it did not BSOD. However, to get my cores stable in coretemp the lowest I seem to be able to put Vcore to is 1.425v, which is quite a big jump.

So my system is stable now with ALL cores fully working, but it max's out at around 76c, instead of 63c as it was before. I think 76c is too much for this chip, i'm sure I read somewhere 67c is max.

Is anyone able to confirm if they have any tricks to get the Vcore down, maybe by increasing voltage on something else??? Also, can anyone confirm the temps, is 76c too high.

I think 4.5GHz with HT should be within the capabilities of this chip without overheating. I know every chip is different, but I have seen people with much lower Vcore at this clock speed. I'm sure I saw someone with a 4.8GHz with HT at 1.30 Vcore on 990x.

I want a 4.5GHz OC for everyday use, hence I want to reduce Vcore if possible.

thanks in advance.
post #9 of 9
Some boards let you reduce the CPU PLL, and some have had good luck reducing Vcore by reducing the CPU PLL.....My board does not support it, do a search.
Your temps are not high, 76c on an i7 is like every day use,[ while OCing,] 100c is max temp before it will start throttling down.

1.30Vcore at 4.8 GHz would be a golden chip in my opinon. But 4.5 GHz at like 1.4-1.60 would be more typical; maybe 1.37-1.55 with the CPU PLL?

Seeing your rig is under water, you should have no problem doing 4.5GHz

Stop worrying about the heat and kick that 990 in the ask
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