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AMD PILEDRIVER - Individual Core/Module Failure [Discussion Thread] (Stability Issues - Stock and Overclocked)

post #1 of 69
Thread Starter 
This thread is for discussions on stability issues with any of the AMD Piledriver CPU's. (At Stock or Overclocked Settings)

Reason - From testing the Piledriver CPU, it seems that some of the CPU Cores are unable to reach certain frequencies at any combaination of settings, with any sort of stability.
***This does not mean ALL Piledriver CPU's. The other purpose of this thread is to determine if there is a certain batch that is affected.

Recommended Stress Test Programs
- OCCT
- Intel Burn Test
** Both of these programs will tell you if your system is stable

Prime95 (Make sure it is Version 27.7 Build 2 or newer)
Prime will be able to show you which individual cores are failing (rounding or hardware failures)

I recommend to test with either IBT, or OCCT first for stability issues, as Prime is much more difficult to have 100% stability, regardless.
Edited by ComputerRestore - 12/30/12 at 5:04pm
post #2 of 69
Thread Starter 
My test system -
Asus M5A99FX Pro 2.0
FX 8350
Kingston HyperX Genesis 1866Mhz Dual Channel Kit



Here is a run of IBT with Cores 1 and 2, 7 and 8. (4.6Ghz Fail)



Here is a run of IBT with Cores 1 and 2, 3 and 4. (4.6Ghz Pass)

From my testing
- Cores 7 and 8 (Module 4) will not run above 4.5Ghz with any sort of stability.
vCore up to 1.5v
- Cores 5 and 6 (Module 3) will not run above 4.7Ghz with any sort of stability.
vCore up to 1.5v (No pictures posted on this)

As you can see from my pictures I've even isolated it down to only running 2 Modules to rule out any possible power or temperature issues

All testing was done in comparison to Cores 1-4, which I've managed up to 5Ghz. Any settings that run cores 1-4 stable while stress testing, I would expect to run other cores as well. Although I've tried changing other settings in an attempt to gain stability (i.e.DRAM Frequency, CPU/NB voltages etc, different levels of LLC - as well as adjusting the voltage control frequencies)

Update


** Temperatures are not typical. This test was done with the back panel off, with a large fan pushing 18 Celsius Ambient Air onto the back of the motherboard

Replacement CPU happily running at 4.7Ghz, all Modules active
Edited by ComputerRestore - 1/14/13 at 6:48am
post #3 of 69
Thread Starter 
Please post if your Piledriver fails to pass any stress tests either at stock settings or with only a mild overclock, despite, increasing voltages, settings, temperatures, etc. Or if you yourself are able to isolate which cores have limited overclocking capebility, please post that as well.

Please post your CPU Batch Number, Model and Stock Voltage with/without Turbo Enabled.
Example: My Info - Batch 1237, FX 8350, 1.332v no Turbo, 1.38v with Turbo
Batch Number is found on the CPU Integrated Heat Spreader

It is still possible that this is a motherboard socket issue - although I have received an RMA number from AMD to have my CPU inspected.
Edited by ComputerRestore - 12/5/12 at 6:09pm
post #4 of 69
So what you're saying is that of the 8 cores that Piledriver packs, not all of them can hit the same frequency? thinking.gif Interesting... I would like to see some data.
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post #5 of 69
Thread Starter 
Information updated - If you're reading this. Thanks for your interest in this matter.
post #6 of 69
I tried doing this on my FX-6300 and noticed I have an issue with module 3. It will not run over ~4400MHz at any voltage below 1.56v. I disabled module 3 (core 4 and 5) and now I can hit 4890MHz at 1.55v. Haven't tried with only 1 module / 2 cores yet but not sure I care about that.. I will probably end up only using these cores most of the time, until I start seeing the games I like to play + the other things I do while gaming requiring two modules. Right now I have a custom loop cooling my CPU and GPU.
Edited by Mr.N00bLaR - 12/7/12 at 6:10am
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post #7 of 69
hello,
I have been limited when I oced my chip (I know not the same cpu) but after looking in to review on a site I realised that it might be my ram as they are saying to add more voltage to stabilize it.
wondering if unstable ram would cause the freezes i get when overclocking, I mean by freezes that the desktops there but nothing is responding at all. could this be my problem when overclocking ?, and maybe that would also be some other peoples problems too?

the review was saying 10% extra voltage, so 1.5 would be set at 1.65v even at the same stock ram clock.
Edited by MrPerforations - 12/6/12 at 10:51pm
    
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post #8 of 69
Thread Starter 
Quote:
Originally Posted by Mr.N00bLaR View Post

I tried doing this on my FX-6300 and noticed I have an issue with module 3. It will not run over ~4400MHz at any voltage below 1.56v. I disabled module 3 (core 4 and 5) and now I can hit 4890MHz at 1.55v. Haven't tried with only 1 module / 2 cores yet but not sure I care about that.. I will probably end up only using these cores most of the time, until I start seeing the games I like to play + the other things I do while gaming requiring two modules. Right now I have a custom loop cooling my CPU and GPU.

Thanks for the info Mr.N00bLaR

Did you also try running only cores 1 and 2, and 5 and 6, to see if cores 5 and 6 would still fail over 4400Mhz.

A couple of other questions as well,
1) Do you know what Batch # your cpu is?
2) Do you have another motherboard you could try? as I'm very curious if this is a CPU socket issue, rather than CPU itself.
Quote:
Originally Posted by MrPerforations View Post

hello,
I have been limited when I oced my chip (I know not the same cpu) but after looking in to review on a site I realised that it might be my ram as they are saying to add more voltage to stabilize it.
wondering if unstable ram would cause the freezes i get when overclocking, I mean by freezes that the desktops there but nothing is responding at all. could this be my problem when overclocking ?, and maybe that would also be some other peoples problems too?
the review was saying 10% extra voltage, so 1.5 would be set at 1.65v even at the same stock ram clock.

@ MrPerforations

There is no doubt that when overclocking anything on your computer you can run into stability issues (Ram included) and having the proper settings is key. So having your Ram set properly will definately effect your ability to have a stable CPU overclock as well, which could very well be others' issues.

What we are looking at here, is "per core" stability issues over a certain frequency despite any combination of settings to keep it stable. As you can see I even went as far as disabling combinations of cores, to show that the problematic cores are in fact problematic. I would definatly be interested in any results you have, that your Bulldozer CPU has similar issues.
Edited by ComputerRestore - 12/7/12 at 8:49am
post #9 of 69
Can we get some discussion in this thread about bus dead zones? I have a 1236 and I'm stable at 200, 230 (+/- 1mhz), 250 (+/-4mhz), and about 273mhz. Anything over 300mhz is failure to initialize boot loader.

Also seems like .5 multipliers are less stable than whole numbers. What are everyone's thoughts on all of this?
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post #10 of 69
Thread Starter 
Quote:
Originally Posted by sdlvx View Post

Can we get some discussion in this thread about bus dead zones? I have a 1236 and I'm stable at 200, 230 (+/- 1mhz), 250 (+/-4mhz), and about 273mhz. Anything over 300mhz is failure to initialize boot loader.
Also seems like .5 multipliers are less stable than whole numbers. What are everyone's thoughts on all of this?

Sure biggrin.gif If anyone is interested in posting their findings.

I should also start to update my OP, as my replacement CPU finally came and is running great. Although it runs much hotter than the other defective CPU, it's a solid overclocker.
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