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PBO2 Undervolt Help with 5800x

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Hi there

After watching this video (
) I might give it a try

I have a AMD Ryzen 7 5800x and I'm getting 72c max load on a NH-L12s (These temps I think are pretty good) (Small ITX PC) (Newest drivers/BIOS) (Stock settings)

Just some questions...

1. - If I go too far with the PBO2 Undervolt can I still open the BIOS?

2. - Which settings do I use?

3. - How do I test if it's stable?

Many thanks.
 

Mussels

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1. PBO cant crash your system, ever - with the exception of too much curve undervolting
2. see the link in my sig
3. again... with the exception of curve undervolting, they dont alter stability at all. since you get crashes at idle and load with the curve, you run some stress tests and then fart about on the PC. get a crash of any kind? reduce the negative offset.
 
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Ok, thanks

Should I go up on 5 "steps" 5, 10, 15 etc then for the PBO2 Undervolt? (Max is 30

And when it crashes will it crash to desktop or restart?
 

Mussels

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Ok, thanks

Should I go up on 5 "steps" 5, 10, 15 etc then for the PBO2 Undervolt? (Max is 30

And when it crashes will it crash to desktop or restart?
Word it that you go up for positive, down for negative
Most people find -10 to -15 is possible on all cores, otherwise you need to spend a lot of time finding what they do individually

as for crashes, that can vary. crashes arent exactly planned.. BSOD, restart, frozen black screen...
 
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I think it is a good tool to control all your profiles simultaneously because there aren't any general settings to control each and everyone's threshold.
I think you can start with EDC, PPT first and then once you are settled on a TDP level for which your cpu cooler can keep up with - in respect to case internal ambient temperature - then curve optimisation is a good option.
PS-TL;DR: don't push it if the temperatures haven't stabilised, or it will have inconsistent safe thresholds which will throw you off balance. TDP control via EDC helps at this point, the heat up phase levels faster and less rapidly.
 
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Oh ok
Thanks
I meant "-5 etc" oops

Word it that you go up for positive, down for negative
Most people find -10 to -15 is possible on all cores, otherwise you need to spend a lot of time finding what they do individually

as for crashes, that can vary. crashes arent exactly planned.. BSOD, restart, frozen black screen...
I did some testing with PBO2 undervolting (-15) but instead of getting the same temps or close with higher clock speeds (like the video) I got 10-15c more. :fear:
Is there something I'm doing wrong? :confused:
 
Last edited:

Mussels

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Did you set a negative or positive offset? you get both choices
 
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Oh ok
Thanks
I meant "-5 etc" oops


I did some testing with PBO2 undervolting (-15) but instead of getting the same temps or close with higher clock speeds (like the video) I got 10-15c more. :fear:
Is there something I'm doing wrong? :confused:
Clocks were lower or higher than stock? What about PPT/TDC/EDC?
 
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Clocks were lower or higher than stock? What about PPT/TDC/EDC?
100-150Mhz higher clocks, same power limits but it seems to be using more power :fear:
 

Mussels

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100-150Mhz higher clocks, same power limits but it seems to be using more power :fear:
that means you were temperature limited previously
 
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Mussels

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But I'm getting 10-15c higher :cry: (from stock to PBO2 undervolt)
when you enable PBO to change the curve, you raise the limits off stock (therefore, no longer stock)
if you got higher temps and clocks, that fits with PBO boosting

you said you were at stock and your power consumption rose, so i replied to that
 
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when you enable PBO to change the curve, you raise the limits off stock (therefore, no longer stock)
if you got higher temps and clocks, that fits with PBO boosting

you said you were at stock and your power consumption rose, so i replied to that
Oh ok thanks

I'm just going to keep it at stock then for the most stable PC
 

Mussels

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Oh ok thanks

I'm just going to keep it at stock then for the most stable PC
If you follow the link in my sig and set the PBO settings there to limit the wattage with your undervolt curve, you'll get what you're looking for
 
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Oh ok thanks

I'm just going to keep it at stock then for the most stable PC
Do not give up J/K .
Stock settings are perfectly fine on that AMD 5800X beast. Great PC Gaming CPU.Can not go wrong with taking advice from Mussels.

Here is my 5800X with AMD Curve Optimizer and if you like big numbers while PC Gaming, not that bigger numbers make any real difference but your e-peen will grow to legendary proportions

EG: Shadow Of The Tomb Raider set to 5150Mhz in BIOS

BIOS setting ,I kept them simple for easy use. Everything is Auto in BIOS except for the changes shown. Now you need to test your own settings, these can get you started.

MSI motherboard here is how I set my Boost to 5150Mhz in the video above.

You can set whatever you want and check stability. First off there are two different areas in all BIOS for PBO stuff.

In the AMD overclocking section ,go to PBO and set your AMD curve optimizer up- this will give you normal boost clock EG:5800X boost to 4850Mhz
In this section you can add up to 200Mhz it is the same for all motherboards EG: 4850Mhz+200Mhz=5050Mhz

If you want higher CPU boost clocks then you need to goto the second area for PBO settings
Advanced CPU Configuration set your PBO boost higher than 200Mhz like in the first section on MSI motherboards you can go as high as 500Mhz

To get 5150Mhz then set PBO here to 300Mhz
So 4850Mhz+300Mhz= 5150Mhz
save and test.
 

Mussels

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Heres what my 5800x was running at last night, seeing 4.4GHz all core boost, with the loop pre-heated from the GPU



You set the PBO settings to keep the temps controlled, and then the curve undervolt lets your clocks boost higher within that limit

I'm getting 4.4GHz all core and 5.05GHz single threaded boost (yes, its rare with modern games)... and the performance is freakin amazing, cause it still gets pretty close to 5GHz in gaming (i limit background tasks when gaming on this system)
 
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Whats a good benchmark to test the performace of the CPU?
Is CPU-Z okay?
 
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But I'm getting 10-15c higher :cry: (from stock to PBO2 undervolt)
That is a sign you have started from way past the performance curve and going in the right direction. Don't just leave it at default. AMD has only recently started taking control from OEM's and issued their own profiles. You wouldn't know what the motherboard did at 'auto' only a microarchitecture ago.
 

Mussels

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Software Windows 10 pro x64 (all systems)
Benchmark Scores Lots of RGB, so you know it's fast.
Whats a good benchmark to test the performace of the CPU?
Is CPU-Z okay?
Cinebench R23 with its 10 minute test is fantastic
 
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Cooling Noctua NH-L12S w/Noctua NT-H2 (Dual NF-A12x15)
Memory Corsair Vengeance LPX 16 GB (2 x 8 GB) DDR4 3200Mhz
Video Card(s) ASUS ROG STRIX AMD Radeon RX 6700 XT OC Edition 12GB With SAM
Storage Samsung 970 EVO PLUS 1TB NVMe M.2 Solid State Drive
Display(s) Gigabyte G27Q GAMING MONITOR 1440p 144hz IPS HDR "1ms" w/Philips Brilliance 24IPLRY
Case Phanteks Evolv Shift Air 2 Anthracite Grey ITX Tower Case w/Full Noctua fans
Audio Device(s) Sony MDR XB950N1 w/Custom speaker system
Power Supply Corsair SF 600 W 80+ Platinum Certified Fully Modular SFX
Mouse Glorious Model D Matte White w/Mousepad: Cooler Master MP511 (Size XL)
Keyboard Cooler Master CK550 Gateron Red Switch w/Tai-Hao Doubleshot PBT Backlit - Cool Gray/Navy
Software Microsoft Windows 10 Pro Full - USB 32/64-bit
Benchmark Scores Pretty fast
CPU-Z cinebench20 or cinebench23. for stability core cycler
Ok, Thanks

That is a sign you have started from way past the performance curve and going in the right direction. Don't just leave it at default. AMD has only recently started taking control from OEM's and issued their own profiles. You wouldn't know what the motherboard did at 'auto' only a microarchitecture ago.
Which settings should I use then?

This is my stock settings CPU-Z score https://valid.x86.fr/r3iq8e
 
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