People are struggling just to get 4.6GHz on the R9 3900X

I think the +200MHz PBO is more of a limit than what is expected clocks

On Zen+ PBO is the limit (i.e. it just allows the cores to turbo to 4.35 on R7 2700X, thermal and EDC/PPT dependent).

 

This is true, but on 2700X 4.35Ghz all core is achievable quite easily (I have been running that for months).
With the 3900X however, I have yet to see a reviewer get it on a single core let alone an all core boost.

 

Reached 4600 on a 3800x with a negative offset of .1. Regularly see 4550 boost on Crosshair Vi Hero.

 

Finally! I ryzen cpu that boost to spec and more. Can you give details of your settings? PBO? Agesa?

 

Nice 3800X on X370 ,do not make me jelly boosting 100Mhz over what's printed on the box.Sweet I should buy 3800X and try it out but I only game and there will be no real difference for me given a few FPS.

 

I haven't gotten it to work on the B350 despite having settings for it.

 

Someone should ask him for his Blender render time at 1.0V then.


edit: found this
https://www.legitreviews.com/amd-ryzen-9-3900x-12-core-cpu-undervolted-to-1-00v_213060

I noticed a number of sites and channels are reporting that the AMD Ryzen 9 3900X 12-core, 24-thread processor can be run at full clock speeds with just 1.00V on the CPU VCore. That sounds pretty damn impressive and I just had to give it a try here to see if that is possible and what that means for performance.
The Ryzen 9 3900X CPU just happens to still be in the Gigabyte AORUS X570 Master motherboard, so I restarted our system and went straight to the CPU Vcore setting in UEFI F5g and took it off ‘AUTO’ and dropped it down manually to 1.20V, 1.10V and 1.00V to see what would happen.

And the final score is 5,942 points! Oh wait, that is way lower than the stock score if 7,105 that I got with stock ‘Auto’ voltage settings. Our performance dropped by just over 16% thanks to undervolting the processor. The power draw at the wall outlet dropped from 216 Watts down to 129 Watts. That means the system is using 40% less power and taking just a 16% hit to performance. That actually is impressive when you think about it! Undervolting the 3900X will allow you to put in small form factor system or use near silent thermal solutions a mini case as long as you are willing to give up some system performance.

---------


edit2: also PBO testing by GamersNexus
https://www.gamersnexus.net/guides/3491-explaining-precision-boost-overdrive-benchmarks-auto-oc

 

Precision Boost vs Precision Boost OverDrive (PBO) vs Auto-OC

https://www.gamersnexus.net/guides/3491-explaining-precision-boost-overdrive-benchmarks-auto-oc


Rough Summary, as I understood the article:

Precision Boost:
Default cpu behavior, designed/implimented by AMD, where one or more cores boosts voltage and clockspeed depending on a combination of Temp limit/Current limit/Power limit. Precision Boost generation 2 is used for the Ryzen 3000 series, to differentiate from Precision Boost generation 1 seen in threadripper.


Precision Boost OverDrive (PBO):
Extra Overclocking feature provided by Mobotherboards, is considered overclocking and thus warranty voiding. Primarily raises the power, current, and temp limits with little to no real world effects at above ambient temps.

Auto-OC:
Extra Overclocking feature provided by Mobotherboards, is considered overclocking and thus warranty voiding. Raises the max POTENTIAL boost for single or all core, CPU clockspeed is still bound by the same limiting factors for Precision Boost.

 

 

As you know, avid fan of your shares and search on differing forums for your posts, so thank you for engaging further .

I do not doubt what you see , or know , I am showing what I see and trying to gain understanding . Maybe it is just my CPU, maybe as R5 3600, dunno, but wanted to share what I see .

I have done retake, pretty much same setup, but VDDG is 0.950 and VDIMM 1.355V. This time I did screen capture at end with more length, 3rd run still going but defo not gonna reach what 6x 2x does.

ZIP with 6x 2x, link. I think the 2x over longer time is showing similar frequency probably due to clock stretch or something else, defo not getting same average VCORE SVI2 TFN as 6x. The shorter RT runs show better difference between scalar change IMO. 4x is pretty much same as 6x for me, I use 6x just to give it room (in mind) for another load, leaving [Auto] scalar does not gain me same average MHz/voltage.

Sample of 3rd run 0x = scalar is [Auto]

Spoiler

Without changing scalar, past PBO+100MHz, I do not gain improved average ACB. As I tweak scalar from say 1x upto 4x I see improved average MHz and slightly higher average voltage.

*** edit ***

0x ie scalar auto never reached clocks or voltage, near end only when CPU go from loaded to idle did it peak to PBO+150MHz.

WMV link.

 

This ZIP has CBR15 3x of multi and 1x single for PBO+150MHz 6x and 2x, not bothering with 0x, as defo no point after seeing 2x.

So as recap.

Short run of Kahru RAM test, say at least 100%, shows more clearly difference as I adjust scalar. Average ACB is improved and voltage used is increased, clock bounce is less, ie improves sustainability of OC.

Longer run of Kahru RAM test seems to show 6x and 2x very similar, but CB R15 shows distinction better on my sample.

 

NEWEST WAY TO OVERCLOCK EVERYONE!!! by CCX with amazing results apprently overclocking via CCX allows for stable 4.5ghz in some instances for the first couple of cores at 1.38v just go ahead and read the thread and look for yourself i cant wait to try this!

I do not however know what settings requires this im not sure if I have to disable PBO or any other overclock settings but from what I can tell this is an amazing performance booster over trying to overclock in otherways


https://www.reddit.com/r/Amd/comments/cefwjg/ty_der8auer_for_per_ccx_oc_recommend_massive/

 

You should check out some of my post on this J/K .I done a few videos on this but I guess I am not dramatic enough LOL

Ryzen Master Is for Gamers is one thread here a few post down.
https://www.overclock.net/forum/10-amd-cpus/1729500-ryzen-master-gamers.html

 

In the video I linked I overclocked 3 CCX and left 3 alone and you can pick and choose what you want.You can also do ram timings/boost overclock/profiles ETC.

 

Are you able to save the per CCX overclocks across different cold boots?

 

I have saved a bunch of profiles for testing.I just import the one I want and do a restart with Ryzen master.It is a great tool and I have do some great overclocks with it.At the moment I am doing BIOS overclocks,I will download the tool linked and see if there is a difference.
EDIT: in video i linked

Experiment with Ryzen Master and enjoy, it is a great tool.Always exit Ryzen Master when finished setting up what you want.

 

Gigabyte Master x570 and x3900 CPU:
For my PBO/PB2 and AutoOC did basically nothing, sometimes a little more or less but no real improvement, dropping the core from Auot to Normal and then adding an offset of -0.050 dropped temps and did nothing either.
What did help was setting everything PB2/PBO/AOC to Auto and bumping the FSB from 100 to 102.5 (need to try more still), simply put let PB2 do what it does and bump everything to basically all core 4150 or 4075 and then add an extra 103.75MHZ to that, or for single core take the max I ever really set of 4350 and add an extra 108.75 to that. so now I'm seeing 4230 or so all core regularly and 4458 single core.

Really sad that I'm back to FSB OC, but at least it works for me.

Note: At 102.5 FSB I'm prime 95 stable for 8 hours using 62GB of 64Gb (3066 CAS16) of RAM, so I'm calling that stable.

 

FSB OC is not for everyone but if it is working good enough then it is good enough.3900X should Boost to 4800Mhx on one core with AMD Precision Boost Overdrive and I would be pissed if it was only hitting 4458 on light loads.
It seems to me you know what you are doing but lower voltage and FBS is not the way to get the best out of your 3900X CPU.I only have 3600X so I can not tell you what is best but some guys in this thread may chime in.

 

ShrimpBrime - 2700X single core boost at 4350 from the box. My max on a single core static oc (manual multi) was 4500Mhz.

No?? OK then..... Max PBO all core boost auto AI overclocking is only 4.0Ghz. With all on auto, multi OC static will do 4.1Ghz change nothing but the multiplier.

What exactly is this thread aimed at? All core boost or single core boost? What is the correct reply above??

 

Precision Boost Overdrive This is a new AMD overclocking tool that voids warranty if used.It has nothing to do with old Ryzen CPU (2600X/2700X)AMD did a poor job I guess in explaining stuff ,only effects Ryzen 3xxx CPU's.
It is overclocking and there is no single core boost or all core boost.Read the first post and I was trying to make people aware of how the Precision Boost Overdrive works and it works,for me it is 4-6 of 12 cores when turned on 99% of the time.

 

I owned a 2600X I know how it worked also.I am not going to argue with you over trivial crap,if you want to argue please go elsewhere and find someone else to mess with.Precision Boost Overdrive works as intended by AMD and it works for me.that is all I have left to say.

 

Relax. If it's trivial at least get your facts straight, there's enough misinformation flying around at lightspeed as it is.

 

I hit 4448 on all cores just by opening a few programs all at the same time. I have not been able to reproduce that effect but this current bios hits max boost on all cores every time I load anything.

 

3800x - New Results for PBO Scaler 3x

You will see higher vCore at this OC level.

 

Guess my 3600X is getting like that AMD fine wine treatment with age:Boost override now up to 4580Mhz.



EDIT:Added some screens to try to get my stupid point across somewhat.The CPU's can boost higher than what's written on the box and there is show much BS out there that they can not.It is all in the BIOS really.

Cinebench 20 all cores hit and past Maximum boost written on the box of 4400Mhz

Valley Benchmark all cores hit and past Maximum boost written on the box of 4400Mhz.

Screens from video if you do not want to look at the boring stuff.


Cinebench20

Core 0=4450Mhz

Core 1=4450Mhz

Core 2=4425Mhz

Core 3=4425Mhz

Core 4=4400Mhz

Core 5=4400Mhz


Valley Benchmark

Core 0=4525Mhz

Core 1=4525Mhz

Core 2=4425Mhz

Core 3=4425Mhz

Core 4=4400Mhz

Core 5=4450Mhz

Spoiler

find nearest open gas station

 

Guess my 3600X is getting like that AMD fine wine treatment with age:Boost override now up to 4580Mhz.







EDIT:Added some screens to try to get my stupid point across somewhat.The CPU's can boost higher than what's written on the box and there is show much BS out there that they can not.It is all in the BIOS really.



Cinebench 20 all cores hit and past Maximum boost written on the box of 4400Mhz



Valley Benchmark all cores hit and past Maximum boost written on the box of 4400Mhz.





https://www.youtube.com/watch?v=AHdzllmzY7c





Screens from video if you do not want to look at the boring stuff.





Cinebench20



Core 0=4450Mhz



Core 1=4450Mhz



Core 2=4425Mhz



Core 3=4425Mhz



Core 4=4400Mhz



Core 5=4400Mhz





Valley Benchmark



Core 0=4525Mhz



Core 1=4525Mhz



Core 2=4425Mhz



Core 3=4425Mhz



Core 4=4400Mhz



Core 5=4450Mhz

Spoiler

find nearest open gas station

Where are the CB scores?
And 1.5v I think it is too much for everyday use.

Or do u have this setup only for Benchs?

Sent from my ONEPLUS A6003 using Tapatalk

 

Looks like AMD lock manual oc i tried everything my motherboard settings provided i tried maxing all setting in BIOS scalar 10x pbo2 maxs at 400mhz 1.5watt temp max limit 110celcius but still on ryzen master if i watch it while cinebench running it just peak at 3600mhz 7x-8x celcius (3700x) and score at cinebench 15 just 17xx but if i oc it in ryzen master it could go to 4.4 and my cinebench 15 can reach 22xx without even trying at all just change the voltage to 1.35 and boom 4.4 there you go. looks like this is idiot proof ,go nuts change everything you want it doesn't matter it won't blew up maxs everything i tried it!(in BIOS at least but in RM i don't know).

On cinebench it detect 4.2 ghz (any speed you put in) speed but the result exactly the same as 3600 if you manual oc it, but if you oc it with ryzen master by then the pbo 2 really worked. So tired trying to settings via BIOS restart over and over, if you want to oc you must open the ryzen master if you closed it ryzen back to default again.

 

I've found Cinebench bad to test PBO limits. Looks like the application has a "performance profile" and sticks to specific clocks/load targets to a extent with other popular benchmarks.

Try anything else Prime95, or games, SuperPiMod and you will see the CPU "unlocked" and getting better performance and seeing the CPU chug Wattage and Amps to a greater extent than what Cinebench R15/R20 will allow. They keep to a ~120watt target for some reason with PB & PBO when it's about the AVX load these use, Test other stuff and you see the performance uplift you want with 1x-10X scalar and AUTO_OC +200Mhz.

Though PBO is bugged in various ways and the limits aren't lifted in all cases depending on which PBO settings you have enabled /adjusted in BIOS. I've not found a complete overview which settings you need to have set to get best performance and not get locked down in some way or another. Been inconsistent from what I've seen to adjust the values.

I've seen hints from users that just setting "enabled" usually is best overall rather than trying to adjust the settings with the scalar and +0-200Mhz settings which for some reason alters the behaviour for the worse. Though I've gotten better performance with PBO than stock PB in the end but it's a hassle rather than just having it AUTO and sticking to PB stock for not much difference unless you want to unlock your PPT, TDC & EDC limits which are a limit at times for some customizability.

I find the "gimp" behaviour for AVX like R15/R20 unwanted and defeating the purpose of PBO entirely. There is still some non-adjustable limit kicking in for these loads somewhere not mentioned by AMD. You only are truly unlocked if doing MANUAL OC, but then you lose that boost behaviour for some extra single core Mhz as the all core sustained quality of the silicon won't allow it to run it all the time.

 

IMO PBO for Ryzen 3xxx is probably what the next AGESA version will target. They have clearly hinted that there will be further revisions, and this would seem like an obvious candidate, given that PBO doesn't really seem to work on 3xxx. Also, I'd imagine they'll probably add further headroom given adequate cooling (low temperatures) - something which the BIOS seems to take very little notice of at the moment, which should be relevant to PBO and manual OCs.

 

That's exactly what AGESA 1003ABBA is supposed to address although PBO worked since 2nd gen Ryzen it's mostly up to MB manufacturers to implement in BIOS just like all other AGESA versions. Some were/are more successful than other. I had steady decline in PBO boost since 3 BIOS versions again and it still didn't hit advertised values, right now it's 150MHz bellow while with first 3rd gen compatible BIOS it was only 20MHz out. Only saving grace is that it boost 4.25GHz on all cores.

 

To test if PBO boost is working, try playing some games to test it.

I think some benchmarks are not always works with PBO boost or full all cores etc.

Last time I ran Cinebench 15 its show around 4000-4025 all cores limit boost.

I played The Elder Scrolls V: Skyrim Special Edition on Steam.

I was surprised this game boost all cores 4.2 all the times with PBO enabled.

What that mean? my Ryzen 3600 and BIOS are confirms working with PBO boost enabled.

Some games, application, benchmark are not optimized to run PBO boost at all.

You can test those to determine which ones that works PBO boosts.

PC spec.

Windows 10 Pro Insider build 18980 with Nvidia driver 440.52.
Ryzen 3600 @ stock speed and PBO enabled, Not Auto.
MSI Gaming Pro Carbon BIOS beta 2B1.
G. Skill Ripjaws 2x8GB 3200 cl14 @ 3800 cl14 IF 1900 FCLK (14-16-14-14-28-42-260 1T) 1.52V (Temp 45 max).
MSI 1050ti 4GB.

 

You set the core ratio manually and then enable PBO? I'm just checking I'm reading it right.

I'm currently running a modded bios with the latest SMU. Not sure how much of an impact the actual AGESA will have.

 

Just go BCLK.