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reddit.com › r › Amd › comments › ltdtg3 › what_is_pbo_scalar

PBO scalar adjusts the FIT/FITness/FailuresInTime limit of your part by that factor. Normally, Ryzen CPUs firmware manages the frequency based on the thermals and voltage and it will reduce your frequency if it sees either of those two going into ranges that reduce the long term reliability of the part. Increasing that limit (at the user’s discretion and own risk, voiding warranty, etc.) can let your system sustain higher frequencies without being throttled. So by default, the scalar is 1x, factory default. If you increase it to 2x, it will double the limit, etc. up to 10x. You’ll have to see if it helps by trial and error because my own system sees zero improvement from this one and I have a 360mm AIO. Answer from RBD10100 on reddit.com

reddit.com › r/amd › what is pbo scalar?

r/Amd on Reddit: What is PBO Scalar?

February 27, 2021 -

In my research it holds voltage longer with PBO to hold the higher frequency? This comes at the cost of temperature obviously but when i set a X10 scalar it doesn't just hold higher voltage it applies 0.5v more all the time to core VID...

I have a custom water loop with CPU under its own 560mm rad. Temps aren't an issue. Is it worth running scalar? Does it provide a measurable increase to single core clocks and how long they hold?

Top answer

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So by default, the scalar is 1x, factory default. If you increase it to 2x, it will double the limit, etc. up to 10x. You’ll have to see if it helps by trial and error because my own system sees zero improvement from this one and I have a 360mm AIO.

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In my testing it did very little and I keep it on Auto or 1x

XDA Developers

xda-developers.com › home › cpu › 6 pbo settings you can change to make your ryzen cpu run even faster

6 PBO settings you can change to make your Ryzen CPU run even faster

March 29, 2025 - There are some CPUs and some cooling solutions where setting a high scalar makes sense, but for everyone else, it's best to leave it as default. Although there are a ton of options when you dig into the PBO settings in your motherboard, the ...

Discussions

What is the best safe PBO scalar for 3700x?

Auto or 10x is not visible in normal work, not even for short benchmarks... Click to expand... I don't agree...but I would agree it will depend a lot on unique system pecularities and how it's set up. On my system I have to enable PBO (take it out of DISABLED) to expose the setting, with PBO in AUTO it does basically nothing whatever scalar ... More on forums.tomshardware.com

forums.tomshardware.com

September 18, 2020

Is PBO scalar 'Auto' just 1x? Prime x670e - Republic of Gamers Forum - 1091967

I'm following scatterbenchers guides ... sets PBO scalar to 10x. While it does improve my benchmark scores, not sure I want 10x 24/7. Not sure how long I plan to keep this CPU/build but prob for another 2-4 years. I know each mobo brand is different, most auto setting is just 1x. I've read gigabyte is 4x or can adjust up to 4x depending on other ... More on rog-forum.asus.com

rog-forum.asus.com

May 7, 2025

Ryzen Master Defaulting PBO Scalar to “OFF”

Do your settings in BIOS once you find the limits in Ryzen Master. Then you wont have to rely on software messing up or not running correctly. More on reddit.com

r/Amd

February 28, 2023

Question about PBO scalar x10

While I personally can't attest to it, I have heard that running PBO scalar at 10x is a very bad decision for mobo/CPU longevity. I do not know exactly how accurately that is. I know AMD recommends 2-3x or keeping it stock, typically. More on reddit.com

r/Amd

April 16, 2021

Tom's Hardware Forum

forums.tomshardware.com › home › overclocking

[SOLVED] - Does PBO degrade the CPU? | Tom's Hardware Forum

April 17, 2020 - But you can enable and tweak PBO and even SCALAR without turning on the automatic overclocking. In my case it doesn't work anyway, probably from something MSI did to break it in their BIOS LOL. Click to expand... From AMD's website, "AMD’s product warranty does not cover damages caused by overclocking, even when overclocking is enabled via AMD hardware and/or software."

Overclock.net

overclock.net › home › forums › amd › amd cpus

5700X and PBO Scalar | Overclock.net

September 15, 2023 - I'm tuning my PBO to the max and by testing I've found out that having PBO Scalar 4X gives a good performance boost in games, going over that nothing really happens. I read online people advise to keep it at 1X or AUTO for "safety reasons", but I also remember Buildzoid talking about it and saying to keep it under 5X, something like that, maybe I'm mistaking.

Tom's Hardware Forum

forums.tomshardware.com › home › cpus

[SOLVED] - What is the best safe PBO scalar for 3700x? | Tom's Hardware Forum

September 18, 2020 - Auto or 10x is not visible in normal work, not even for short benchmarks... Click to expand... I don't agree...but I would agree it will depend a lot on unique system pecularities and how it's set up. On my system I have to enable PBO (take it out of DISABLED) to expose the setting, with PBO in AUTO it does basically nothing whatever scalar ...

SkatterBencher

skatterbencher.com › home › amd precision boost overdrive 2

AMD Precision Boost Overdrive 2 - SkatterBencher

July 27, 2024 - In Scenario 6, we set the scalar value to 10X. In Scenario 7, we use the Curve Optimizer and try an all-core negative value of 30 and 15. While negative 30 did in fact pass our PBO-2 tests, ultimately it was not stable enough to pass the other benchmarks.

Asus

rog-forum.asus.com › t5 › amd-500-400-series › is-pbo-scalar-auto-just-1x-prime-x670e › td-p › 1091967

Is PBO scalar 'Auto' just 1x? Prime x670e - Republic of Gamers Forum - 1091967

May 7, 2025 - But what about Asus? Is auto just 1x scalar or does it adjust or go up to say 3x? ... Auto is 1x as far as I know. It doesn't dynamically change. Use RopBench and you will see Scalar value in use. On the rise and fall of the clock cycle...

reddit.com › r/amd › ryzen master defaulting pbo scalar to “off”

r/Amd on Reddit: Ryzen Master Defaulting PBO Scalar to “OFF”

February 28, 2023 -

I have a Ryzen 5 5600(Non-X) Curve optimizer ON; All Core Values -30 Control Mode: Auto OC PBO Scalar: ON

Works good keeping the Temps in a good range (idle & loaded) My issue is that when I restart, it seems that Ryzen Master or BIOS is turning off PBO Scalar. When I re-open RMaster it shows

Curve optimizer ON; All Core Values -30 Control Mode: Auto OC PBO Scalar: OFF

Even after being off or asleep it idles at about 65-70° until I Re-Apply the Profile (Re-Enabling PBO) where it decreases to 35-40°

Does PBO Scalar Reduce Temps? I though the Opposite.
is there a way to permanently “apply” the Profile even after Windows Boot?

Top answer

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Do your settings in BIOS once you find the limits in Ryzen Master. Then you wont have to rely on software messing up or not running correctly.

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PBO scalar should increase temps under an all-core load if it's working normally. In the Ryzen Master settings menu there's an option for "Persistent PCD Values." That will maintain your profile between reboots. Personally, I don't use Ryzen Master and use the PBO in the AMD section in the BIOS, as I've found it's the more reliable and less buggy approach. Not sure what exactly you have going on with your system, but it sounds like bugged behavior, so I'd suggest doing the same and using your BIOS instead of Ryzen Master.

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Overclock.net

overclock.net › home › forums › amd › amd cpus

Guide - Fully optimise your PBO | Overclock.net

June 12, 2021 - Unless you are going for some records you are best off leaving PBO limits at default while only trying to find good Curve Optimizer offsets. Diminishing returns kick in fast and hard, with measly performance increases relative to the increase ...

reddit.com › r/amd › question about pbo scalar x10

r/Amd on Reddit: Question about PBO scalar x10

April 16, 2021 -

I've been playing around with my 3700x settings, I realised that when I set scalar to x10 I start getting that juicy 4.4Ghz more often than stock and I'm happy with performance, I also have LLC set to mode 3 on my MSI x570 MPG Gaming Plus, voltage doesn't exceed 1.490mv on light loads (same as scalar x1), max temp was 50c, please note that I use CTR hybrid profile for multicore tasks so whenever the CPU usage exceeds 30%, the profile activates and it sets to 4.3Ghz all cores at 1.325mv then at 80% it sets to 4.15Ghz at 1.244mv.

So I made sure that stock settings with scalar x10 only runs on light loads like gaming.

Is this safe?

Top answer

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This will be long and sorry for grammar, new phone with a tiny keyboard haha. Scalar is good if you limit PPT, with high scalar x10 I could hit 4.5ghz all core boost in gaming on my old 3900x. What I recommend is to look at voltage during ST and MT tests. My 3900x I had my vcore set to normal in the gigabyte BIOS so i could adjust the dynamic vcore to -.025v which is just an offset as 3000 series dont have curve adjustment. I then set PPT to 145 and TDC to 230 and EDC to 1 (for edc bug to get high single boost in games, allowed comparable performance to my 8700k @5ghz). Also had a scalar of x10. Do note this was on f12h bios for the aorus xtreme so it was quite well before the ryzen 5000 bios which stopped the edc bug working. Anywho so if you want to know if your pbo settings are safe, do a prime95 test, ensure hwinfo64 polling rate is set to 500ms instead of 2000 as this will capture accurate data as ryzen changes many times per second. Only have that polling speed for stability testing not benching as it chews more cpu time to poll fast. During prime95 if smallest fft all core goes above 1.26v back off the scalar in 1x increments OR lower PPT. Single boosting usually doesnt go over 100w and a 3900x 145w cap saw me get 1.24v in smallest fft. Due to your lower core count you may need a lower ppt limit to go under 1.26v in prime95. Once you have it under 1.26v all core, test single thread by literally browsing the web or doing CB R20 single thread. If it goes over 1.5v you need to back off of scalar, ppt lowering wont help you here because it will destroy your multi core performance. If you need to back off of scalar for single core voltage, find the sweet spot for single voltage then go and increase ppt until you have single under 1.5v and multi under 1.26v under load. This will ensure your silicon stress is fine and you wont degrade your chip. Doing these tests for a few minutes wont damage your chip as long as temps are fine. If you run it like that for weeks though you can expect max boost to degrade if above those voltage limits. Basically in hwinfo64, all-core over 1.26v with edc/tdc in hwinfo over 140+ will degrade, some have been ok at 1.296v but i dont know how they went long term. For single the edc1 setting uncaps edc in single boost so over 1.5v with 95-100 edc/tdc showing in hwinfo64 will also degrade your chip. If you can find your balance and remain within those limits you should get the best of both st and mt for your chip. Best of luck.

GamersNexus

gamersnexus.net › guides › 3491-explaining-precision-boost-overdrive-benchmarks-auto-oc

Explaining AMD Ryzen Precision Boost Overdrive (PBO), AutoOC, & Benchmarks | GamersNexus

July 16, 2019 - We also ran two further passes with the 3900X in the Godlike board with the CLC fan and pump speed slowed, PBO on and off, to see whether Overdrive is more helpful when the CPU is warmer. On the X570 Master with the R5 3600 and PBO disabled, Cinebench R20 scored 3759 multithreaded/484 single threaded. Simply setting PBO to “enabled” scored 3748/485, and setting PBO to motherboard limits (functionally the same as max), maxing throttle temp and PBO scalar, and applying the AutoOC 200MHz offset scored 3765/496.

Asus

rog-forum.asus.com › t5 › overclocking-tweaking › are-there-any-official-comments-regarding-scalar-1-10x-settings › td-p › 1098387

Are there any official comments regarding scalar 1... - Republic of Gamers Forum - 1098387

May 24, 2025 - I've really tried to understand this topic based on what I found online. In case anyone asks, here are my current settings: EXPO I enabled PBO enabled Curve optimizer: -20 +200 MHz boost override Scalar: 10x Motherboard limits enabled · My Cinebench R23/R24 scores are in line with other similar OCs. Stability tests like OCCT and AIDA64 ran for 30–60 minutes with no issues. I’ve been gaming for the past three weeks without any crashes or instability, so I’d say it's stable.

Overclock.net

overclock.net › home › forums › amd › amd cpus

9950x3d scalar safety. | Overclock.net

August 29, 2025 - Scalar basically increases the voltage PBO will use to reach and sustain peak boost. However, being voltage limited is pretty rare, so scalar rarely comes into play in any meaningful way.

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Tom's Hardware Forum

forums.tomshardware.com › home › cpus

Question - PBO - doing it wrong? | Tom's Hardware Forum

November 20, 2022 - Going for +200MHz and higher EDC setting might give you 5.05Ghz boosts in light bursty workloads on your gold star cores (all cores if you get per-core CO set up right) but they heat up quickly and pulls back on clocks sooner, and more, in heavy (Cinebench) workloads. The same with PBO Scalar settings. For my 5800X I find +25 or 50Mhz and a scalar setting of x2 is about optimum for Cinebench scores.

reddit.com › r/overclocking › amd ryzen master pbo scalar default ratio

r/overclocking on Reddit: AMD Ryzen Master PBO Scalar default ratio

February 1, 2024 -

If i turn on the PBO Scalar in Ryzen Master, is it automatically setting a 10x ratio like in the bios?

Or is it below that.

Top answer

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....whoa what the fuck What kind of bios do you have where Precision Boost Scalar: Auto MEANS 10X?!? you don't want 10x. Unless you're trying to burn the chip out.

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Pbo scalar does nothing in my experience so I always just leave it at 1x which is auto

H|ard|Forum

hardforum.com › [h]ard|ware › amd processors

Resolved. | Page 8 | [H]ard|Forum

October 31, 2024 - Even without scalar the CPU runs fine so my suggestion would be to keep at Auto or 1X. Also in my testing the added voltage was from 0.1 to 0.15 volts so from 1.2 volts to 1.3 or 1.35 volts. These are just observation of highs in HWINFO. Not sure what are the sustained volts but this was sort of negating the whole PBO undervolt that I was doing.

reddit.com › r/overclocking › question about pbo scalar on ryzen 5000 and pbo + co boosting behaviour and longevity

r/overclocking on Reddit: Question about PBO Scalar on Ryzen 5000 and PBO + CO boosting behaviour and longevity

March 21, 2022 -

From what i've been reading online opinion on PBO scalar has been a mixed bag. Alot of people have recommended to run Scalar at 1x and others have recommended it at 10x or 2x or 4x. Previously with the 2700X it was recommended to just leave this at AUTO but with my current 5600X i seem to be getting better results and stability with it at 10X. I have +200Mhz and CO tuned which gives me the following results at high temp (28-30c) ambient.

CB R23 MC: 11929 CB R23 SC: 1595

CPU Z MC: 5140 CPU Z SC: 660

Temps while gaming are in the mid 60s and highest i've seen it reach 71c while the clocks are 4.725-4.8Ghz. This is with a 240mm Deepcool L240 v2 AiO.

Lower Scalar of Auto or 1x give me slightly worse performance but I am mostly concerned that is it safe to have it at 10X. Something to also note is that i can do -15 on the worst core with Scalar at 10X compared to -10 when Scalar is at 1X.

Top answer

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If you understand what it does, you can answer that question for yourself. Blindly punching in numbers and hoping for the best is not a good approach. From another post: " PBO scalar adjusts the FIT/FITness/FailuresInTime limit of your part by that factor. Normally, Ryzen CPUs firmware manages the frequency based on the thermals and voltage and it will reduce your frequency if it sees either of those two going into ranges that reduce the long term reliability of the part. Increasing that limit (at the user’s discretion and own risk, voiding warranty, etc.) can let your system sustain higher frequencies without being throttled. So by default, the scalar is 1x, factory default. If you increase it to 2x, it will double the limit, etc. up to 10x. You’ll have to see if it helps by trial and error because my own system sees zero improvement from this one and I have a 360mm AIO. "

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How are you testing core optimiser? How different are the scores? I'd look at a variety of tests, Geekbench, y cruncher, etc. See that a good score in one isn't poor elsewhere. Adobe comment about warranty, I've also seen a few opt against scalar, but think any PBO technically voids warranty.

XDA Developers

xda-developers.com › home › cpu › 3 reasons amd pbo is important for your new ryzen cpus

3 reasons AMD PBO is important for your new Ryzen CPUs

November 13, 2024 - Once you find it, set the PPT, TDC, and EDC limits to Auto, and experiment with the rest of the settings until you get a stable overclock. You can start by setting PBO scalar to 10X, CPU boost clock to +200MHz, and Curve Optimizer to -10.

Albert Herd

albertherd.com › 2020 › 12 › 13 › my-experience-with-precision-boost-overdrive-2-on-a-5900x

My Experience with Precision Boost Overdrive 2 on a 5900X – Albert Herd

January 13, 2021 - I have set the PBO scalar to manual and 10x. I will be honest I am not sure what impact this has, but it looks like a setting which needs tweaking. I’ve tried 1X and honestly I did not feel any difference. From what I can understand, this is the length of how much the CPU will remain pumping high voltage / clocks until it dials it down.