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AMD FX Stable Voltages & Frequencies Thread - Page 3

post #21 of 73
Quote:
Originally Posted by Erick View Post

almstsobur
What's your stability criteria?
How did you tested, i dont want proof i just want to know how you consider it stable.
I can run cinebench at 5.2ghz with 1.55v, but cant play games at 5ghz.

I've done 30-40 min primes, Y-cruncher full benchmarks 1-6. and played Rift or BF3 for multiple Hrs on end. Never a crash freeze, lockup, BSOD or anything since I finalized my settings. Don't get me wrong it was 2-3 weeks of trial and error and adding a 360MM external radiator to make it happen. It almost caused a break-up ... GF was ready to leave me ... lol mad.gif I found Y-cruncher and Rift to be the best stability testers, those were the 2 that would fail prior to getting everything dialed in just right. I'm a 2 clicks on CPU voltage above what's "needed" but my cooling allows for that and I consider it stability headroom. I leave it like this, 24/7 I don't use any other profiles. I just have C1E and C6 enabled for idle energy savings. My CPU voltage may be closer to 1.57, it clicks between 1.56-157.
Edited by almstsobur - 2/15/12 at 8:23pm
post #22 of 73
I will tell you what my 3 not so obvious final hurdles were. It did not like a 25X multiplier till I upped the VDDA voltage. And for some reason though my memory is rated at 9-9-9-27-45 for 2000Mhz, I had to do to 9-10-9-27-45 @ 1866 for pure stability, maybe cause i'm running 4 sticks, maybe something else.. Also, if you are reaching CPU socket threshold, back down to 2400 NB and you should be able to run 1.20-1.25 NB/CPU voltage this will re-leave some heat on the socket temps. I also lapped my CPU to a mirror finish copper on copper and removed all my motherboard Heatsinks and re-did them, including the thermal foam stuff on the Mofsets, it was running very hot 80+C under long term full load testing.
post #23 of 73
Thanks, almstsobur

While you were testing with prime95, did you come across a error: "illegal sumout" 100 warning 0 erros, and the thread stops?
Almost 90% of the time i get it error, and i dont know if it is CORE related of CPU/NB related, sometimes Vcore fixes it and some times cpu/nb fixes.

Any clues?

-Erick
post #24 of 73
This is a Y-cruncher Pi-Benchmark #6 multi-thread 4.75GB 1,000,000,000 decimal digits. If it can pass this I can pretty much assure you it's stable and will handle any gaming. If you pass this yet crash games, I would suggest Power Supply, cause your video draw may be pushing you over the edge. This machine pulls 560 watts from the wall outlet in just that multi-thread y-cruncher. These CPU's suck the juice at max load when OC'ed this high.

391
Edited by almstsobur - 2/15/12 at 9:03pm
post #25 of 73
Quote:
Originally Posted by Erick View Post

Thanks, almstsobur
While you were testing with prime95, did you come across a error: "illegal sumout" 100 warning 0 erros, and the thread stops?
Almost 90% of the time i get it error, and i dont know if it is CORE related of CPU/NB related, sometimes Vcore fixes it and some times cpu/nb fixes.
Any clues?
-Erick

Yes, I was getting that on core 6 I needed to add CPU voltage (I think, I was making too many tweaks at once, learned my lesson) . I would take the NB out of the equation though, lower it to 2400, also loosen the ram timings or lower ram speed. no point trying to trouble-shoot 3 or 4 possible problems. Try to narrow it to just 1 cause. I suspect CPU voltage however. Also, if you are on an ASUS board, run thermal radar, if your mosfets are overheating you will become unstable. easiest way to tell is if it crashed after 2-3 successful lines of prime, or if you are breaking 82+ in thermal radar. Seriously though, my final issues for one reason or another were memory, even if the same settings were used fine at a lower clock, don't assume they are good at a higher clock. I know it sounds counter intuitive, but for some reason it was an issue, at least for me. 4.8Ghz 9-9-9-27-45 was fine at 5Ghz I had to go 9-10-9-27-45.
Edited by almstsobur - 2/15/12 at 9:15pm
post #26 of 73
Quote:
Originally Posted by Erick View Post

If it's stable, why should you?

Well... I ran Prime95 and I got a fatal error on 2 cores. I need to do some tweaking.
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Ol' Betsy (Main)
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post #27 of 73
almstsobur

I took cpu/nb and memory out of the equation, by running them at 2000mhz and 800mhz( yes 800mhz DDR3) with 11-12-11-28-46-2T.


thenk83

What error was it? illegal sumout?

rounding error?
post #28 of 73
Quote:
Originally Posted by Erick View Post

almstsobur
I took cpu/nb and memory out of the equation, by running them at 2000mhz and 800mhz( yes 800mhz DDR3) with 11-12-11-28-46-2T.
thenk83
What error was it? illegal sumout?
rounding error?

Possible hardware failure, consult readme.txt file, restarting test.
ERROR: ILLEGAL SUMOUT
Maximum number of warnings exceeded.
[Wed Feb 15 20:47:20 2012]
FATAL ERROR: Rounding was 0.5, expected less than 0.4
Hardware failure detected, consult stress.txt file.
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Ol' Betsy (Main)
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post #29 of 73
Quote:
Originally Posted by thenk83 View Post

Possible hardware failure, consult readme.txt file, restarting test.
ERROR: ILLEGAL SUMOUT
Maximum number of warnings exceeded.
[Wed Feb 15 20:47:20 2012]
FATAL ERROR: Rounding was 0.5, expected less than 0.4
Hardware failure detected, consult stress.txt file.

those are 2 errors, did they occur in different threads?

for the rounding error 0.5> 0.4 you need to raise the VRAM VREFCA CPU from 0.500 to 0.505.

Illegal sumout try raising the Vcore or the CPU/NB, if you raise too much Vcore and doesnt fix go back and raise the cpu/nb.

On thing that helps to determine what helps it, seeing how long it takes for the error to appear, the longer it takes the closer to stable it is.
post #30 of 73
Quote:
Originally Posted by almstsobur View Post

Below are my FX-8150 settings at 5.0Ghz completely stable. I’m not about to run 6 Hrs of prime to prove this, I know it’s stable, take it or leave it; these settings may help someone. I’ve done my fair share of Prime, Y-cruncher and boat loads of gaming without any issues since it’s been dialed in. This machine pulls 600+ watts at these settings under 8 cores of full load, if someone wants to pay my power bill I might screen-shot a 6 Hr prime. I’ve messed around with 19 X 150 ~230 X 21 etc. but didn’t notice any gains worth losing the simplicity of 25 X 200. I have not even tried to go a hair over 5.0Ghz, I have a decent amount of cooling headroom left but I am more than satisfied with the performance and nice big round number.
5.0 Ghz 24/7 Stable 200X25
- Vcore under load 1.56V
- Vcore Idle 1.11V C1E & C6 Enabled
- CPUNB 1.35V 2600Mhz-
- RAM Specs 8GB 4X2Gb Kingston hyperX 2000 @ 1866 1.65V 9-10-9-27-45
- HT Settings 1.20V 2600Mhz
- Motherboard Specs and Settings. Asus Sabertooth 990FX
CPU LLC Ultra High
NB LLC High
CPU VDDA 2.6V
VRM Fixed 500k Hz
525

A little update on this, I have found a slight performance increase and no stability loss going to:

20 X 250 @ 5000
2500 @ 1.30V NB
2750 @ 1.25V HT (3000 is stable as well but showed no improvement)
DDR3 @ 2000 1.68V 9-9-9
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