Ryzen 9 3900x Voltage and Temperature

[Dos101]

did you try 1usmus Power Plan ?
I don't know how much it improves performance because I'm using it since the beginning, but everyone told me to use it.
From my multiple tests I can say that undervolt can help if you are somehow temperature limited (approaching 80º the CPU starts dropping voltage and clock speed) but I found the "sweet spot" between -0.075 and -0.0625 V.
More and you are slightly affecting single core performance, less and there is no visible results.
In my case PBO isn't helping at all.

I have tried that power plan and I got similar results to that of using stock settings in the BIOS. My biggest issue is that when I make a change that gets me better temeperatures it always comes at the cost of single core performance.

 

[Max(IT)]

I have tried that power plan and I got similar results to that of using stock settings in the BIOS. My biggest issue is that when I make a change that gets me better temeperatures it always comes at the cost of single core performance.

485 single core definitely is too low for a 3900XT (it is a little low even for a 3900X)

 

[Shou Miko]

Going to 4.2GHz all-core I went up 280 pts in CB20 at the same voltage.



and I limit my SOC voltage to show max 1.050V in bios and HWInfo64 reports 1.012-1.031V.

 

[Max(IT)]

Going to 4.2GHz all-core I went up 280 pts in CB20 at the same voltage.

View attachment 165310

and I limit my SOC voltage to show max 1.050V in bios and HWInfo64 reports 1.012-1.031V.

interesting results.
You used a fixed multiplier 42X and fixed voltage of 1.3 V ?

What about single core performance in that configuration ?

 

[Shou Miko]

458pts and yes It should be higher, but I am only doing 4.2GHz so maybe I should try to see if I can set a single core boost even I rarely use it.



I have to get going on my 4km power walk now so I am not gonna do more any more tweaks for now.

 

[AsRock]

I use all core 4.2 @ 1.275v no offset, max cpu temp 73c with a ambient of 32c. If let it run without the voltage limit and let the core's run as high as they can go i drop too about 7k and single goes up about the 500's.

i am happy with all core performance which is why i never really bothered messing any more, i do not use any single core applications that make it matter, how ever i might try finding the max to each core just to see how that turns out.

All so if you want higher scores maybe consider shutting down all applications that are not needed.

 

[Max(IT)]

I use all core 4.2 @ 1.275v no offset, max cpu temp 73c with a ambient of 32c. If let it run without the voltage limit and let the core's run as high as they can go i drop too about 7k and single goes up about the 500's.

i am happy with all core performance which is why i never really bothered messing any more, i do not use any single core applications that make it matter, how ever i might try finding the max to each core just to see how that turns out.

All so if you want higher scores maybe consider shutting down all applications that are not needed.

Did you try gaming with that settings compared to stock ?
I mean, gaming is not exactly a single core application but not even a multi core application (it depends on the game engine itself).
During gaming most of the time my CPU stay around 4.2 GHz, often with every thread populated (that depends on the game), but sometimes a few cores go higher at 4.4 GHz.

I'm curious about performance in a fixed clock situation like that.

 

[AsRock]

Stock adds about 10c with no gaming difference as i can tell, but i am not all that fussy hitting 50-60fps i am happy haha. CPU never got over 55c while playing RDR2(100's of hours) but i am only using a AMD 390X.

I think it's falling a sleep haha, with the 3770k i was using the usage was was around 50-75%.

 

[Max(IT)]

Just to update who wrote about my "2700X ST performance", today with a slightly lower ambient temperature:



with a -0.075 V undervolt.

 

[vinny_tec]

I got my 3900x running on all core at 4.4Ghz 1.425v offset on a MSI X570 tomahawk Motherboard and some Patriot viper 3733 locked 1:1 3600mhz, running on a Cooled by triple open loop triple 120mm radiator and Phantek c350a waterblock. Stable on Prime 95 and occt stress test.

Was able to get 4.5 ghz on all core with 1.45v however this custom cooling setup might be the waterblock or my D5 pump not able to keep up with the heat after 15 mins of stress test hits 95C +

Highest multi core cinebench score I got was 7919. all cores on full load 55C to 75C and idle around 40C. My ram timings and settings are below in the screenshot.

 

[Max(IT)]

I got my 3900x running on all core at 4.4Ghz 1.425v offset on a MSI X570 tomahawk Motherboard and some Patriot viper 3733 locked 1:1 3600mhz, running on a Cooled by triple open loop triple 120mm radiator and Phantek c350a waterblock. Stable on Prime 95 and occt stress test.

Was able to get 4.5 ghz on all core with 1.45v however this custom cooling setup might be the waterblock or my D5 pump not able to keep up with the heat after 15 mins of stress test hits 95C +

Highest multi core cinebench score I got was 7919. all cores on full load 55C to 75C and idle around 40C. My ram timings and settings are below in the screenshot.

Great results.
I wasn't looking for any record
I just want to fine tune my stock CPU, and I think I did it.

I'm not sure about playing around with LLC and how it could improve/degrade things

On my Intel setup I used it and it was useful but I don't know about AMD.

 

[vinny_tec]

Great results.
I wasn't looking for any record
I just want to fine tune my stock CPU, and I think I did it.

I'm not sure about playing around with LLC and how it could improve/degrade things

On my Intel setup I used it and it was useful but I don't know about AMD.

Stock??!! lol gotta live on the edge a little bit

I have my LLC on auto and haven't experimented much with that. Had it on level 3 and it just made my machine run slower.

I actually never tried running stock I went from box to case to windows and straight to overclock.

 

[Leonoid007]

I found PBO for my 3950x is not working very well. I went with manual OC and lost about 3% single core performance while got at least 8% multi thread gain.
Temps are the same as with PBO.

I have 4.3Ghz CCD0 and 4.2Ghz CCD1 vcore 1.28125v and LLC 5 for cpu and LLC4 soc. Under load SVI2 in hw shows 1.262v and 1.281 max (LLC5 is not enough?)

Max temp on CCD1 89.3 but mostly around 86 under load CCD0 temp is 86 max with normally 83 under load. Idles around 40.

It hits EDC limit of 190Amp and max CPU power 206wt (ouch!)

I have air cooler Noctua NH-U12A

What do you guys think? I feel I can push it a bit. But I actually think this is good result!

 

[Shou Miko]

I found PBO for my 3950x is not working very well. I went with manual OC and lost about 3% single core performance while got at least 8% multi thread gain.
Temps are the same as with PBO.

I have 4.3Ghz CCD0 and 4.2Ghz CCD1 vcore 1.28125v and LLC 5 for cpu and LLC4 soc. Under load SVI2 in hw shows 1.262v and 1.281 max (LLC5 is not enough?)

Max temp on CCD1 89.3 but mostly around 86 under load CCD0 temp is 86 max with normally 83 under load. Idles around 40.

It hits EDC limit of 190Amp and max CPU power 206wt (ouch!)

I have air cooler Noctua NH-U12A

What do you guys think? I feel I can push it a bit. But I actually think this is good result!

View attachment 165594

This intimidates me more and more to buy a Noctua air cooler to replace my Fractal Design Celsius S24 but how is noise with your current setup @Leonoid007 ???

 

[Leonoid007]

The noise is OK. When there is no load it's very silent. Under load it might be a bit louder than would be water cooling (I tried water cooling and the temps with basic 240mm and pump noise - all the time, when under load it's also noisy). I did not see much difference, what is different I now have full case of fans which would not be possible with AIO. I have mid tower so limited to 6 fans max

This intimidates me more and more to buy a Noctua air cooler to replace my Fractal Design Celsius S24 but how is noise with your current setup @Leonoid007 ???

 

[Shou Miko]

The noise is OK. When there is no load it's very silent. Under load it might be a bit louder than would be water cooling (I tried water cooling and the temps with basic 240mm and pump noise - all the time, when under load it's also noisy). I did not see much difference, what is different I now have full case of fans which would not be possible with AIO. I have mid tower so limited to 6 fans max

Ah make sense, I got Cougar's Conquer case for now so there is a lot of air in it because it's a open design.

Link: https://cougargaming.com/us/products/cases/conquer/

 

[vinny_tec]

I found PBO for my 3950x is not working very well. I went with manual OC and lost about 3% single core performance while got at least 8% multi thread gain.
Temps are the same as with PBO.

I have 4.3Ghz CCD0 and 4.2Ghz CCD1 vcore 1.28125v and LLC 5 for cpu and LLC4 soc. Under load SVI2 in hw shows 1.262v and 1.281 max (LLC5 is not enough?)

Max temp on CCD1 89.3 but mostly around 86 under load CCD0 temp is 86 max with normally 83 under load. Idles around 40.

It hits EDC limit of 190Amp and max CPU power 206wt (ouch!)

I have air cooler Noctua NH-U12A

What do you guys think? I feel I can push it a bit. But I actually think this is good result!

View attachment 165594

I'm not familiar with 3950X but look like you have headroom with the voltages, pretty sure you could go a bit higher however your air cooler will just not be able to keep up.
I would recommend to leave the highest stable overclock settings and if you wish to go higher get a custom watercooling setup.
At the end of the day you're system is already fast stock and unless you want those extra 15- 20 fps in games, encoding or rendering for productivity that would shaves off minutes.
Overclocking ryzen is just for fun to see how far you can push it.

 

[Max(IT)]

as a side note I've just noticed Asus pulled BIOS 1002, released a week ago, from their website, without any note.
I have that BIOS installed...

 

[Leonoid007]

I'm not familiar with 3950X but look like you have headroom with the voltages, pretty sure you could go a bit higher however your air cooler will just not be able to keep up.
I would recommend to leave the highest stable overclock settings and if you wish to go higher get a custom watercooling setup.
At the end of the day you're system is already fast stock and unless you want those extra 15- 20 fps in games, encoding or rendering for productivity that would shaves off minutes.
Overclocking ryzen is just for fun to see how far you can push it.

I am ok with my current setup. I don't really care about few more Mhz

I just want maximum speed and maximum safety in OC. I think I nailed it. My final settings:

CCD0 4.375 Ghz
CCD1 4.225 / 4.2 Ghz (last 4 cores wont do more than 4.2 with current voltage)

core v 1.281
temps are 83-86 under load

CB20 score 9920

 

[Shou Miko]

It would be nice if @Leonoid007 would fill out the System Specs so show all what's under the bonnet / hood

 

[Leonoid007]

Sorry I think I already mentioned all that somewhere in this thread, very short summary:

MB: Asus Tuf x570 plus wifi with latest BIOS update
CPU: Ryzen 9 3950X
RAM: 64GB Corsair 3200
Cooler: Noctua NH-U12A (Air high end)
PSU: SeaSonic 1200 Platinum
GPU: Nvidia GTX 1080TI
SSD: Sabrent 2TB Rocket Nvme PCIe 4.0
Case: Phanteks Eclipse P400A (mesh front) white

It would be nice if @Leonoid007 would fill out the System Specs so show all what's under the bonnet / hood

 

[Max(IT)]

Sorry I think I already mentioned all that somewhere in this thread, very short summary:

MB: Asus Tuf x570 plus wifi with latest BIOS update
CPU: Ryzen 9 3950X
RAM: 64GB Corsair 3200
Cooler: Noctua NH-U12A (Air high end)
PSU: SeaSonic 1200 Platinum
GPU: Nvidia GTX 1080TI
SSD: Sabrent 2TB Rocket Nvme PCIe 4.0
Case: Phanteks Eclipse P400A (mesh front) white

there is a section in your user profile where you can fill up those info.

 

[Leonoid007]

there is a section in your user profile where you can fill up those info.

Thank you, just filled it up

 

[Antrax360]

Hello guys sorry for bringing this back up. Recently got an asus tuf gaming x570 wifi model and the 3900x. All settings at stocks i would see the vcore jump up to 1.45 and temps would spike so crazy. Like running cinebench would go to high 80s. I did the vcore offset by -1 but when i go into hwmonitor i see under VPU VDD voltages higher then the ones i set up. Do i have to set up those individually? Iddle temps with offset -1 are in 34c eith noctua d15. Cinebench goes to 67. Im not trying to do any oc. Just want better temps and not those voltages spikes.

 

[Max(IT)]

Th

Hello guys sorry for bringing this back up. Recently got an asus tuf gaming x570 wifi model and the 3900x. All settings at stocks i would see the vcore jump up to 1.45 and temps would spike so crazy. Like running cinebench would go to high 80s. I did the vcore offset by -1 but when i go into hwmonitor i see under VPU VDD voltages higher then the ones i set up. Do i have to set up those individually? Iddle temps with offset -1 are in 34c eith noctua d15. Cinebench goes to 67. Im not trying to do any oc. Just want better temps and not those voltages spikes.

in my opinion there is nothing really wrong with your computer.
voltage spikes at 1.45 V or higher are absolutely normal with a 3900X. I would lower your offset a little bit ( maybe at -0.0725 V) because in my opinion you are slightly reducing performance with -0.1 V, but don’t worry about voltage. Cinebench at 80° is not out of ordinary (on my system I reach 78°).

btw why you are using 3200 DDR4 at 3000 ?