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8350, small fft 30-50 min pass. Blend for 40 sec fails.

post #1 of 16
Thread Starter 
Hi all,

I’m trying to OC my 8350 with just tweaking the multiplier. I have gotten Prime95 to pass a small fft for 30-50 min, however I cannot get the blend test to pass (fails within 40 seconds). I’ve gone ahead and tested my memory with the latest memtest, no errors found. I’m not sure what to do next, I’ve tried bumping the power up on different settings individually and it didn’t seem to help. Core temps are around 52-54C with a small fft. Let me know if anything looks off in the settings below. (Note that the pic are of the system set for 4.6GHz, when set to 4.7 I just change the cpu voltage)


23.0 - 1.362500V Sm fft pass, blend fail.

23.5 - -1.381250V Sm fft pass, blend fail.

Fractal Design Arc Midi R2 with Window Side Panel
Mushkin Redline 8GB 1600 7-8-7-24 1.65V
ASUS SABERTOOTH 990FX R2.0
Noctua D-14
EVGA 850 (can't remember which exact ver.)
2 MSI 970s
4TB HDD
1TB SSD














Sorry if this is not as neat as it could be, posting during a break at work is easier today. Let me know if anything else is needed. Thanks for your time thumb.gif

*Edit Link to the memory
http://www.newegg.com/Product/Product.aspx?Item=N82E16820226201&cm_re=desktop_memory_model_996999-_-20-226-201-_-Product
Edited by changingtide - 2/25/16 at 12:02pm
post #2 of 16
I'm sorry if all I can do is guess here, but did you try to leave the RAM timings on Auto or maybe loosen them a bit manually?

As I said I can only guess and at first I thought the Memory Controller would be the cause but then I saw you increased the CPU/NB voltage already and you didn't even raise it's frequency, so it would be kind of weird if that was unstable (only speaking from my limited experience)...
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post #3 of 16
Thread Starter 
Thanks for the reply anyways:D. I was afraid I'd have to lower the memory in some way. Sucks because its got tight timings and I paid a bit more for that. The MB under auto set it to 1333 from 1600 and the timings were higher on auto (don't remember what they were right now). I'll wait and see if anyone else has some input. I'm sure I'll have to lower the memory, but I hope not.

As a side note I did try and OC via the bus but had less success.
post #4 of 16
Thread Starter 
I just put all memory settings to auto and tried again, still failed but it did get a little farther. Tried 4.7 and 4.6 both still failed. Going to possibly revert to default and run a blend just to see what happens. Man this is annoying.

Update: I Reset all settings and manually set my ram settings to stock and not auto. Passed 25 minutes of blend. Looks like the CPU oc is not stable. Is it not strange that it passes a small fft but not blend?

Going to oc till it wants more volts then test blend again...
Edited by changingtide - 2/25/16 at 3:43pm
post #5 of 16
Hmm....just to be sure: you are running the latest bios, yes?

After having a second look at your voltages, I think they are quite low for the clocks your running with it. Not as low that it would be impossible but f.e. my 8350 needs much more to reach 4.6GHz. Mine is fine with 1.35v until 4.4GHz but after that it quickly needs to be ramped up to about 1.4v to get past 4.5GHz. Might of course just be my chip but have you tried voltages past 1.4v to get 4.6 GHz stable in blend?

Also you could try to set CPU/NB frequency to 2400 since your running the voltage on it to do so anyway. I don't think that it is too low and therefor causing your issue but then again I don't know enough about architectures to be sure. It just seems very unlikely to me biggrin.gif


EDIT: Just had another thought. Do you use LLC to compensate the v-droop? If not that might help getting it stable without having to raise the cpu voltage further permanently.
Edited by f1LL - 2/25/16 at 4:10pm
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post #6 of 16
Thread Starter 
I am running the latest BIOS. I thought my voltages were low too but it seems to run the small fft fine. Just for testing I'm running stock 3.5v at 4.42 right now with over 15 min with no fails. I'll set it back to 4.7 and try running it at 1.4v to start with. I went a few bumps above 1.381250v at 4.7 for the quick small test and it ran it fine so I lowered it to 1.381250 to keep it cooler. I'll give 1.4v @ 4.7 a try now and report back.
post #7 of 16
Thread Starter 
Quote:
Originally Posted by f1LL View Post



EDIT: Just had another thought. Do you use LLC to compensate the v-droop? If not that might help getting it stable without having to raise the cpu voltage further permanently.

I'll look for the setting and see what its on.

LLC is set to Ultra High- 75%
Edited by changingtide - 2/25/16 at 4:19pm
post #8 of 16
Sounds good to me. Just try and try and try different steps to get closer to stable and cool enough settings wink.gif I spent many hours over several days to find that I'm not satisfied with my cooling biggrin.gif
It's a good way to get to know the limits of your hardware tongue.gif

Good luck and post updates!thumb.gif
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post #9 of 16
Thread Starter 
Thanks thumb.gif

I've been at this for 4 days every night, so its starting to get to me....blinksmiley.gif

After tonight I may just leave it at 4.4-4.5, were ever it holds on stock, and take what I can get.
post #10 of 16
i always use blend to test stability, never small fets.

i have a fx83xx that needs 1.45 underload while running prime. when you think you have it, run prime95 for 12hrs.

use hwmonitor or hwinfo64 to monitor your vcore and temps.

you can use ibt 20-30 passes on very high for a quick test. if it fails it won't pass prime95.

http://www.majorgeeks.com/files/details/intelburntest.html

leave your memory on auto till you get your oc stable.


ud
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