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[Official] ASUS sabertooth AMD Owners Club - Page 955

Poll Results: whats your choice for 990fx

Poll expired: Jul 11, 2011  
  • 0% (1)
    Asus M5A97evo
  • 0% (1)
    Asus M5A99Xevo
  • 49% (58)
    Asus Sabertooth 990fx
  • 31% (37)
    Asus Crosshair V Formula / Thunderbolt
  • 0% (1)
    Biostar TA-990FXE
  • 12% (15)
    Gigabyte GA-990FXA-UD7
  • 4% (5)
    MSI 990FXA-GD80
118 Total Votes  
post #9541 of 10163
yeah, the non avx edition of ibt isn't worth using... the avx edition works pretty good on all current amd cpu's... but with intel I tend to use OCCT now... not sure really how well it does, but I notice it does generate some heat when using the linepack test.
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post #9542 of 10163
Quote:
Originally Posted by tashcz View Post

Thanks man.

I get all your words, but I just feel IBT is too much. Really hard to get it stable and requires much more voltage than Burn In Test I was using. One hour of CPU and RAM stress testing usually did the job - even though it's not as fast as IBT but while using a 630W PSU and a OC'd 8320 with a GTX970, it wouldn't be normal for the CPU to pull 500W and the GPU to pull 200W since I'd get over the max current the PSU can give. IBT is really weird and stresses much more than needed I think. Never had an issue with a burn in test stable system.

Anyway, are you saying that LLC should just keep a constant voltage and not up it under load? Since I was using it to up my voltage under full load to maintain stability, like from 1.52 to 1.56.

And I'm thinking of swapping my 8320 for a 8320E or 8370E since I'm needing 1.560V now for stability on 4.7GHz, on Aura. Used to be 1.47V or 1.50V on Sabertooth as I remember.

Anything over 1.475V exceeds the operating limits of Vishera (32nm SHP SOI) and will cause permanent damage/degredation to the chip. This can range from reduced lifespan to lower maximum overclock to inability to remain stable at stock speed. Power consumption is also insane at over 1.4V so pushing that far doesn't really make any sense and is a contributing reason to why we are seeing AM3+ motherboard failures after 2-3 years of operating at increased voltages and clockspeeds.

LLC should be set to a value where it doesn't increase voltage during load while keeping VDROOP minimal. On previous Asus motherboards the second highest setting was usually best.
post #9543 of 10163
Looks like I was stuck with that DS3P for a long time and forgot how LLC is supposed to work.

I can keep stable under load - Burn in test - ran it for 6 hrs and passed - IBT also passess. But what causes problems is leaving the PC on at the night because in the morning I see the Windows 8.1 recovery screen. Looks like it will need 1.56V constantly, not only under load, to be stable. 1.524 while idling isn't enough.

And considering other posts, seems like the chip degraded for those 4 years, even though I always monitored core, VRM and socket temperatures.

Or playing simple, I degraded it frown.gif But must saved it served well for 4 years on 4.7GHz+. Will try to see if it can still run stable at constant 1.56V and consider getting an E version, if that is any good in october 2016.
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post #9544 of 10163
Quote:
Originally Posted by InfamousTR View Post

Anything over 1.475V exceeds the operating limits of Vishera (32nm SHP SOI) and will cause permanent damage/degredation to the chip. This can range from reduced lifespan to lower maximum overclock to inability to remain stable at stock speed. Power consumption is also insane at over 1.4V so pushing that far doesn't really make any sense and is a contributing reason to why we are seeing AM3+ motherboard failures after 2-3 years of operating at increased voltages and clockspeeds.

LLC should be set to a value where it doesn't increase voltage during load while keeping VDROOP minimal. On previous Asus motherboards the second highest setting was usually best.
I'll leave it to the experts to chime in, but in my experience these chips are beasts... 1.55v is the stated recommended limit from AMD last I checked.... mine defaults to over 1.45 @ base clocks and peaks out to 1.5 @ turbo clocks 9590... this is based on measurements not vid.

edit: taken from vishera owners thread...

General Information:

- 70C is the maximum recommended temp for the CPU Core temp reading.
- 1.55v is the maximum recommended voltage.
- Stock HyperTransport speed is 2600Mhz.
- Stock NorthBridge speed is 2200Mhz.
Edited by Minotaurtoo - 10/9/16 at 8:59am
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post #9545 of 10163
Your 8320 sounds a lot like my old 8350. The most I could get out of it was 4.8 and I pushed it as hard as 1.6 volts on the Sabertooth. I used regular LLC and vcore would vary from a high of 1.608 to a low of 1.524 to 1.536 at 100% load. If your vcore is going up at 100% load, then you are using too much LLC in my opinion. The most that others have used keeps the vcore steady at all loads while I accept a little vdroop in the interest of lower temperatures.

Stress testing is important, and not all tests are created equal. As I see it IBT AVX comes closest to real world loads what with games pushing the cpu harder than before. The argument that you never see loads like that are not as persuasive as it used to be and you have to know your system is stable at high loads and temperatures.
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post #9546 of 10163
Quote:
Originally Posted by miklkit View Post

Your 8320 sounds a lot like my old 8350. The most I could get out of it was 4.8 and I pushed it as hard as 1.6 volts on the Sabertooth. I used regular LLC and vcore would vary from a high of 1.608 to a low of 1.524 to 1.536 at 100% load. If your vcore is going up at 100% load, then you are using too much LLC in my opinion. The most that others have used keeps the vcore steady at all loads while I accept a little vdroop in the interest of lower temperatures.

Stress testing is important, and not all tests are created equal. As I see it IBT AVX comes closest to real world loads what with games pushing the cpu harder than before. The argument that you never see loads like that are not as persuasive as it used to be and you have to know your system is stable at high loads and temperatures.

Yeah, my vcore is going up under load, first to 1.548, and after some tome it gets to 1.56V. I thought it would be better to have stability under full load, never thought idle would crash it. I was stuck on constant 1.60V for some time on my DS3P and forgot a few things. Seems like I'll need to try 1.548V at idle and 1.56V under full load to maintain stability.

Biggest problem now is that stress tests pass and full load isn't the issue, it's the idle state that messes with the system. But with LLC messing with idle voltages too, it's kind of hard to get the needed LLC level and voltage setting in BIOS to get that 1.548-1.560 under load.

This all started when I was setting the pump to work at 50% PWM when under 40C socket temps. At one point I saw it was 0RPM and the core temps were 70c, I powered the system off imidiatly, and I had some trouble booting then, did the CMOS reset, flashed the BIOS again, but I'm getting those weird things happening on my system now that didn't happen. Either the chip really degraded or it's the combo of a bad chip + wrong power settings in the BIOS. Anyway I'm getting pretty annoyed with this.
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post #9547 of 10163
I've heard of people having crashing at idle problems but never experienced it meself. The speculation is that when the cpu comes under a sudden load the voltage doesn't pick up fast enough and it starves out and dies. Do you have CnQ running? It might help.
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Junkyard Dog
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post #9548 of 10163
Quote:
Originally Posted by miklkit View Post

I've heard of people having crashing at idle problems but never experienced it meself. The speculation is that when the cpu comes under a sudden load the voltage doesn't pick up fast enough and it starves out and dies. Do you have CnQ running? It might help.

Nope, still haven't enable cnq, I'm thinking of using those power options when I'm 100% sure my overclock is stable, and since I got the board a few days ago, it still needed some testing. I'll try with constant 1.548V on idle and 1.56 or 1.572 on load and see what happens. But the PC must be idle for the whole night and crash not in order for me to see if it's stable.
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post #9549 of 10163
Quote:
Originally Posted by Minotaurtoo View Post

I'll leave it to the experts to chime in, but in my experience these chips are beasts... 1.55v is the stated recommended limit from AMD last I checked.... mine defaults to over 1.45 @ base clocks and peaks out to 1.5 @ turbo clocks 9590... this is based on measurements not vid.

edit: taken from vishera owners thread...

General Information:

- 70C is the maximum recommended temp for the CPU Core temp reading.
- 1.55v is the maximum recommended voltage.
- Stock HyperTransport speed is 2600Mhz.
- Stock NorthBridge speed is 2200Mhz.

I don't know where they have come up with 1.55V as the FX Performance tuning guide states 1.50V is the maximum voltage when using conventional cooling methods. http://www.amd.com/Documents/AMD_FX_Performance_Tuning_Guide.pdf

The maximum voltage also differs with individual CPU leakage current where low leakage chips can sustain higher voltages than high leakage chips. AMD also implements Vdroop to reduce voltage and power consumption when the CPU is under heavy load and this has an effect on the specification as well.

The temperature information is rather poorly worded since Zambezi/Vishera has no temperature sensors for individual cores and many monitoring programs report the wrong value (tCTL instead of tCase).
post #9550 of 10163
Quote:
Originally Posted by InfamousTR View Post

I don't know where they have come up with 1.55V as the FX Performance tuning guide states 1.50V is the maximum voltage when using conventional cooling methods. http://www.amd.com/Documents/AMD_FX_Performance_Tuning_Guide.pdf

The maximum voltage also differs with individual CPU leakage current where low leakage chips can sustain higher voltages than high leakage chips. AMD also implements Vdroop to reduce voltage and power consumption when the CPU is under heavy load and this has an effect on the specification as well.

The temperature information is rather poorly worded since Zambezi/Vishera has no temperature sensors for individual cores and many monitoring programs report the wrong value (tCTL instead of tCase).

Another thing I remember is the max socket temp of 62c on continuous use? Even though most of us go away with under 70.
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