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Why you should undervolt your Ryzen 3000 - Part II

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post #11 of 89 (permalink) Old 01-04-2020, 09:22 PM
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how low on voltage do you guys typically get on Ryzen 3000 at stock clocks?

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post #12 of 89 (permalink) Old 01-04-2020, 09:30 PM
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Quote: Originally Posted by The Pook View Post
how low on voltage do you guys typically get on Ryzen 3000 at stock clocks?
In my case, now I do not run stock at all but when I tested it, I was fine up to -0.05vcore..... I only tired -0.100 before and it yielded worse results. I'll give it another shot to see. But this was without PBO, only stack standard.

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post #13 of 89 (permalink) Old 01-04-2020, 09:48 PM - Thread Starter
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Quote: Originally Posted by The Pook View Post
how low on voltage do you guys typically get on Ryzen 3000 at stock clocks?
IMHO, you dont want to undervolt Ryzen 3000 at stock unless the goal is for quieter low powered mini systems. This will be a loss in stock performance

Instead try undervolt with auto PBO overclock to get the best out of your CPU. The internal FIT will do its job to ensure stability and safety.
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post #14 of 89 (permalink) Old 01-04-2020, 10:27 PM
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Quote: Originally Posted by dansi View Post
Hear me out! I know we had this theory before!
Thanks to The Silt writeup on FIT and VFT curves, i finally understand AMD have made Ryzen 3000 closer to GPU boosting than old Intel Turbos.

The biggest problem with initial testings, the reviewers did not fully unclock the PBO motherboard limits!
Which being the PPT, TDC and EDC limits of your motherboard to supply unlimited powah to Ryzen 3000.

Back to the VFT curve, volt, freq and thermals.

Zen2 follows a strict VF curve, depending on chiplets, every cores can only run at x'Ghz with y'Volts, at certain temp. Go past that thermal mark, it will drop a multiplier or more.
As such you see core temps are the ultimate decisions at how long you can boost to. Sure say a 3950X can boost to 4.7Ghz at 1.45v, but without strong cooling, it wil not sustain for long.

So to keep thermals down, you can use super chiller cooling or you live in sub 20c ambient or you simply undervolt it! Hear me out again!
Now consider how small the 3000 IHS is, how small 7nm is, to dissipate heat with a regular WC is tougher than ever0! Again thanks to Silt, who calculated the heat density, regular WC and regular ambient are not conducive enough to remove heat fast! The key word is fast!

So now with undervolt, your VF curve shift downwards, so you go from 1.45v to 1.4v, and your boost clocks drops to 4.65Ghz. However, your temps are down 5-8C, which means 4.65Ghz is able to sustain longer!

Back to the bolded, now try with PBO on, +200Mhz, and unlock your PPT/TDC/EDC values, return all LLC to default vdroop. The goal is to lower voltages as much as we can, while supplying as much current and power the CPU can accept. Don't worry the FIT inside the chiplets will maintain the safety levels of current it can absorb!
On assumption you already have a good cooling solution, say a Noctua or 240mm AIO

Be prepared to be surprised!

Boost clock is a lot of crap un;ess you are a competitive gamer. For productivity worl am nual all core overclock is still the way to go. PBO is a real waste of time for all core overclocking and so is the current state of the AMD agesa code 1.0.0.4 It requires higher voltages for all-core overclocking. It is pig swill as far as I am concerned. Higher voltages and lower overclcoks on all cores, that is what AMD gave us to placate the competitive gamers. They are going to have to do better than this swill and I will be on their case like white on rice.

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post #15 of 89 (permalink) Old 01-04-2020, 10:29 PM - Thread Starter
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Quote: Originally Posted by os2wiz View Post
Boost clock is a lot of crap un;ess you are a competitive gamer. For productivity worl am nual all core overclock is still the way to go. PBO is a real waste of time for all core overclocking and so is the current state of the AMD agesa code 1.0.0.4 It requires higher voltages for all-core overclocking. It is pig swill as far as I am concerned. Higher voltages and lower overclcoks on all cores, that is what AMD gave us to placate the competitive gamers. They are going to have to do better than this swill and I will be on their case like white on rice.
Disagree on the PBO part, give PBO a retry. Perhaps the current firmware improves on it, or perhaps we misunderstood the application initially.

I forgot to add, disable PBO Scalar too.

The goal is to lower voltages as much as we can, while supplying as much current and power the 3000 Ryzen can accept.

Last edited by dansi; 01-04-2020 at 11:09 PM.
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post #16 of 89 (permalink) Old 01-04-2020, 11:29 PM - Thread Starter
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https://www.reddit.com/r/Amd/comment...afe_for_zen_2/

This is where PBO overclock may be safer than manual overclock.

Supply as much current as your motherboard can generate and let the FIT parameters do their job on vcore needs.
Mean time, use undervolting to control the temps to hold higher sustained clocks.
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post #17 of 89 (permalink) Old 01-05-2020, 11:17 AM
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Quote: Originally Posted by dansi View Post
Disagree on the PBO part, give PBO a retry. Perhaps the current firmware improves on it, or perhaps we misunderstood the application initially.

I forgot to add, disable PBO Scalar too.

The goal is to lower voltages as much as we can, while supplying as much current and power the 3000 Ryzen can accept.
What does PBO Scalar do?

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post #18 of 89 (permalink) Old 01-05-2020, 02:18 PM
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Quote: Originally Posted by dansi View Post
Disagree on the PBO part, give PBO a retry. Perhaps the current firmware improves on it, or perhaps we misunderstood the application initially.

I forgot to add, disable PBO Scalar too.

The goal is to lower voltages as much as we can, while supplying as much current and power the 3000 Ryzen can accept.
If the goal is lower voltages AMD failed, as on my all core overclocks with agesa 1.0.0.4 voltage requirements for manual all core overclock are higher than ever. That is my complaint. I am not delusional.

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post #19 of 89 (permalink) Old 01-05-2020, 04:25 PM
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Quote: Originally Posted by os2wiz View Post
If the goal is lower voltages AMD failed, as on my all core overclocks with agesa 1.0.0.4 voltage requirements for manual all core overclock are higher than ever. That is my complaint. I am not delusional.
Hi @os2wiz it seems like you not having much fun with Agesa 1.0.0.4. It is a pitty, I've had nothing but good results using it. I went from two 3900X, to my second 3950X and all good. Both the first 3900X and 3950X I had was not all that best with clocking, but on both occasions the second one I got did a lot better. I'm with you on manual overclocking and I am lucky that the 3950X I have now is stable at 4.2ghz using only 1.1875vcore.

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post #20 of 89 (permalink) Old 01-05-2020, 07:21 PM - Thread Starter
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Quote: Originally Posted by os2wiz View Post
If the goal is lower voltages AMD failed, as on my all core overclocks with agesa 1.0.0.4 voltage requirements for manual all core overclock are higher than ever. That is my complaint. I am not delusional.
Try not to use manual overclock and use pbo as presented in this thread. Remember low voltages as possible.

Tbh, most people do not need a fixed all cores loadout, we are better off with amd precision boost and it is safer to boot!
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