5800X3D Undervolting / Negative C.O. Settings

Bloot

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==========================
EDIT

Please see Sticky in AMD Section for more info.

Alan J T


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Please add vcore negative offset setting for the 5800X3D, other boards do have it so you can undervolt it, my B550 Tomahawk on bios A90 has removed it and I can't undervolt this CPU, which is a big problem as this CPU is pretty hot at stock voltages.



Thanks!
 
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Alan J T

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That CPU has zero OC or Undervolt settings as per AMD guidelines for it,
You will have to ask AMD to allow that as MSI will not want to be responsible for any OC setting you apply to a Locked CPU.
 

Bloot

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That CPU has zero OC or Undervolt settings as per AMD guidelines for it,
You will have to ask AMD to allow that as MSI will not want to be responsible for any OC setting you apply to a Locked CPU.
Well, thanks for the response, but I've seen other board vendors who have this options, the cpu is locked at 1.35V, yes, but yet you can set a voltage in that range, set a negative offset so it stays cooler, it makes no sense hiding options that other vendors do have for this CPU, aswell as the SMT setting, it's gone in this board, it's nuts.

I mean, the CPU is locked, why hide options that work like cpu voltage negative offset? That won't damage that cpu, on the contrary, it's safer staying cooler...

I guess I'll have to switch to another mobo if MSI don't listen to reason.
 
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plutomate

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If Robert Hallock made it clear that the AMD is NOT allowing 5800X3D overclocking or core voltage adjustment, it means you're looking for the wrong guy :bonk:
 

Xentar712

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If Robert Hallock made it clear that the AMD is NOT allowing 5800X3D overclocking or core voltage adjustment, it means you're looking for the wrong guy :bonk:
Except Asus motherboard owners all have voltage control right now. And have shown 20-40c difference in CPU temps. I'd rather have the option...
 

Alan J T

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Except Asus motherboard owners all have voltage control right now. And have shown 20-40c difference in CPU temps. I'd rather have the option...
Perhaps but who takes the hit to the wallet with a RMA when AMD ask what board it was on and AMD reply so AUSU are running a unauthorised modified bios so Warranty is void.
Who you going to get pissed at then,
I would say MSI will be more than happy to do it if AMD approve it but not before.
 

Xentar712

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Well, thanks for the response, but I've seen other board vendors who have this options, the cpu is locked at 1.35V, yes, but yet you can set a voltage in that range, set a negative offset so it stays cooler, it makes no sense hiding options that other vendors do have for this CPU, aswell as the SMT setting, it's gone in this board, it's nuts.

I mean, the CPU is locked, why hide options that work like cpu voltage negative offset? That won't damage that cpu, on the contrary, it's safer staying cooler...

I guess I'll have to switch to another mobo if MSI don't listen to reason.
I found an interesting software tool that takes 15C off my temps with an easy 50 mv UV. Check out my temps with some Cinebench runs
Untitled.png
. Link was here:https://www.overclock.net/threads/5800x3d-owners.1798046/post-28975484
 

bcbrowne57

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New 5800X3D user here... upgraded from 5600X on my X570 Unify board with the AGESA 1.2.0.6c BIOS. CPU cooled by an EK-240 AIO in a well-ventilated case.

Out of the box performance was excellent as expected, but I was concerned about high temps. At 1440P (3840x1600) in MS Flight Simulator flight, CPU temps were steady at 83C. Same with Cinebench 23 multi-core runs. In the BIOS, I have enabled CPPC and CPPC preferred cores, selected "low current idle" and reduced PPT from 140 to 125 watts, but there is no option to apply a negative offset to CPU voltage or (better still) to apply negative Curve Optimizer offsets.

The good news is, I found a freeware utility called "PBO2 Tuner," which allowed me to test various negative C.O. settings up to -30 per core. After stress testing I now have all cores except one at -30, with the outlier at -25. Bottom line: Performance is unaffected (actually a little bit better on Cinebench, from 14,6XX to 14,8XX) AND temperatures are better: down from 83 to 78C for the high under load. Per HWINFO 64, my VCORE under load dropped from about 1.25 to 1.17 volts. Fans turning slower, system is quieter, and I am now more confident in this chip's long-term durability. The only down-side is that the PBO2 Tuner settings are not persistent: I need to re-set the offsets with every logon.

So... if anyone from MSI ever reviews these forums, PLEASE give users the option to apply negative (ONLY negative) C.O. settings in the BIOS. This is NOT "overclocking" by any stretch of the imagination, so AMD should have no issues with it. Does anyone know whether the just-released 1.2.0.7 BETA BIOS offers any undervolting ability?
 

fatedust

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So... if anyone from MSI ever reviews these forums, PLEASE give users the option to apply negative (ONLY negative) C.O. settings in the BIOS. This is NOT "overclocking" by any stretch of the imagination, so AMD should have no issues with it.
As far as I know, AMD locks overclocking and underclocking on 5800X3D...
 

Xentar712

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New 5800X3D user here... upgraded from 5600X on my X570 Unify board with the AGESA 1.2.0.6c BIOS. CPU cooled by an EK-240 AIO in a well-ventilated case.

Out of the box performance was excellent as expected, but I was concerned about high temps. At 1440P (3840x1600) in MS Flight Simulator flight, CPU temps were steady at 83C. Same with Cinebench 23 multi-core runs. In the BIOS, I have enabled CPPC and CPPC preferred cores, selected "low current idle" and reduced PPT from 140 to 125 watts, but there is no option to apply a negative offset to CPU voltage or (better still) to apply negative Curve Optimizer offsets.

The good news is, I found a freeware utility called "PBO2 Tuner," which allowed me to test various negative C.O. settings up to -30 per core. After stress testing I now have all cores except one at -30, with the outlier at -25. Bottom line: Performance is unaffected (actually a little bit better on Cinebench, from 14,6XX to 14,8XX) AND temperatures are better: down from 83 to 78C for the high under load. Per HWINFO 64, my VCORE under load dropped from about 1.25 to 1.17 volts. Fans turning slower, system is quieter, and I am now more confident in this chip's long-term durability. The only down-side is that the PBO2 Tuner settings are not persistent: I need to re-set the offsets with every logon.

So... if anyone from MSI ever reviews these forums, PLEASE give users the option to apply negative (ONLY negative) C.O. settings in the BIOS. This is NOT "overclocking" by any stretch of the imagination, so AMD should have no issues with it. Does anyone know whether the just-released 1.2.0.7 BETA BIOS offers any undervolting ability?
Just checked. The latest bios doesn't help...
 

Xentar712

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You can try this new beta bios:
which has additional vcore offset, PBO and curve optimizer:
View attachment 160331View attachment 160332View attachment 160333View attachment 160334View attachment 160335View attachment 160336
Note: However MSI people do not recommend to modify any settings regarding CPU overclocking!
Nooo!! Literally it's the day after I switched motherboards lol. Oh well, I'm glad you were able to update it. I gave up after hearing no word for so long, otherwise I would have waited.
 

Alan J T

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Nooo!! Literally it's the day after I switched motherboards lol. Oh well, I'm glad you were able to update it. I gave up after hearing no word for so long, otherwise I would have waited.
Testing takes time and we don't know how many R7 5800X3D MSI have to test with of how many Staff. Plus it not helping with Intel Dropping 4 new Chipsets this year that are still buggy.
 

darth_lugoj

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hello, totally agree, the negative offset is necessary and it is not dangerous, if MSI does not implement this option, they will lose a client, although I doubt they will care
 

Bloot

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i believe MSI is going to release BIOS which enables offset sooner or later, MSI BIOS release schedule is not always on top of the line though, sometimes might take a while
View attachment 160646
Thank you, SMT, CO, PBO and negative offset vcore, that's awesome. I was about to switch boards lol

Hope the bios is out for my B550 Tomahawk soon. Thanks again.
 
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