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post #21 of 69
Does a chart of wafer location by batch number exist publicly? Might provide some insight.
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post #22 of 69
Thread Starter 
Quote:
Originally Posted by BenC View Post

Does a chart of wafer location by batch number exist publicly? Might provide some insight.

Piledriver Data Collection Thread

Here is a data collection thread that was started. It only uses the Date Stamp, because the actual Batch numbers aren't made public. I have the actual Batch number for my replacement CPU because of the paperwork AMD sent with it. It's like 11 digits long.
Althought this Thread doesn't rule out user error. It does provide some insight.
post #23 of 69
I made a quick histogram of the data collection thread by batch number. Lower batches have higher average OCs. OC decreases steadily towards 1244, with 1240 having the lowest average (n = 1). However the sample size is ridiculous; this is only suggestive. Range is 5 to 4.7, median is 4.8, mode is 5, average is 4.84, and n = 10.
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post #24 of 69
Thread Starter 
Quote:
Originally Posted by BenC View Post

I made a quick histogram of the data collection thread by batch number. Lower batches have higher average OCs. OC decreases steadily towards 1244, with 1240 having the lowest average (n = 1). However the sample size is ridiculous; this is only suggestive. Range is 5 to 4.7, median is 4.8, mode is 5, average is 4.84, and n = 10.

Yes, the sample size is way too small. But hopefully it can grow to be a little more suggestive. It will never be scientifically sound, as there's too many variables outside of just the CPU's. That and it only follows the "Honor System" on Stability, or what each individual considers stability.
post #25 of 69
hello again,
might be that like mine, the 6+2 vrm can't distribute power to the 8 core correctly when heavily overclocked?

I found even 4.2ghz is unstable, but with six core's I can get to 4.7ghz and then temp max is reached.
I ran 4.6ghz on 1.464v( two ticks above in bios) and ultra high cpu load line config.
Edited by MrPerforations - 1/2/13 at 12:26pm
    
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post #26 of 69
Thread Starter 
Quote:
Originally Posted by MrPerforations View Post

hello again,
might be that like mine, the 6+2 vrm can't distribute power to the 8 core correctly when heavily overclocked?
I found even 4.2ghz is unstable, but with six core's I can get to 4.7ghz and then temp max is reached.
I ran 4.6ghz on 1.464v and ultra high cpu load line config.

I use the M5A99FX PRO 2.0. It also has 6+2 Digital Power Control. It handles the 8 Core just fine.
If you have the most up to date BIOS to support your Bulldozer, I'd try running Prime 95 to see if there are defective Cores.
If there is, then disable them to see if you get better stability at the same or higher Overclock.
You'll also want to disable all but Module 1 and the defective Cores and retest to rule out power issues, or motherboard issues.
post #27 of 69
Getting a new FX-8350 tomorrow or monday (NCIX ExpressRMA is awesome), I hope I'll have more luck than a defect module at stock clock...
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post #28 of 69
Quote:
Originally Posted by ComputerRestore View Post

I should add that with my new CPU in order to run at 4.7Ghz or above:
- I had to increase the CPU/NB Voltage from 1.18v (Auto LLC) to 1.25v (High LLC)
- I had to increase the Amperage for CPU and CPU/NB to 130%
- This allowed me to run with a vCore of 1.416v (Ultra High LLC)
- I could accomplish the same thing by running 1.47v+ for the CPU and 1.18v on the CPU/NB (Auto LLC)

Can i do the same with my FX-8320 / sabertooth 990fx? right now im 1.476 @4.8 but playing with this "I had to increase the Amperage for CPU and CPU/NB to 130%" looks more useful, Can you guide me?

My old config: v1.42 @ 4560MHz maybe doing what you did i can improve my voltages.

Right now my BUS 272, NB v1.3 @2450MHz and HT 2450 too. (NB its stable i think, maybe i dont need to add more amp or maybe yes)
Edited by Vlackrs - 1/5/13 at 5:48pm
post #29 of 69
Thread Starter 
Quote:
Originally Posted by Vlackrs View Post

Can i do the same with my FX-8320 / sabertooth 990fx? right now im 1.476 @4.8 but playing with this "I had to increase the Amperage for CPU and CPU/NB to 130%" looks more useful, Can you guide me?
My old config: v1.42 @ 4560MHz maybe doing what you did i can improve my voltages.
Right now my BUS 272, NB v1.3 @2450MHz and HT 2450 too. (NB its stable i think, maybe i dont need to add more amp or maybe yes)

The Amperage settings are in the Digi+ Controls

You might be able to improve your voltages by increasing the amperage. I need 1.332v to run at 4.5Ghz. Although, I have the FX8350 which has a 500Mhz lead, so you may be good at your settings.
Also, there are two NB voltage settings.
-CPU/NB which is for the Memory Controller
- NB for the North Bridge

Do you have the NB voltage at 1.3v? Cause that's pretty high for your settings. I think the stock voltage is 1.1v. If it's the CPU/NB that you have at 1.3v, that's ok though.
Edited by ComputerRestore - 1/7/13 at 6:31am
post #30 of 69
Well, a new cpu that works better at least, not a golden chip, but it is something thumb.gif
Number is 1245

After playing with it a little I got it stable at 4.8 @ 1.481V (LLC ultra high / 130%). I have a weaker 3rd module tough as 4.8 ghz @ 1.45V seems to only fail with the 5th and 6th core.

A final IBT after a run of P95 (I think I can lower the voltage tough, been running all the evening trough various test at 1.476V)
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