Question CPU undervoltage but no time reduction ?

[AndGarP7]

hello everyone,

My system
CPU: Ryzen 9800X3D
Cooler: Asus ROG Ryujin III Extreme
Mobo: Asus ROG X870E Hero
RAM: 2 x 16GB Corsair Dominator Platinum 6000 cl30
PSU: Seasonic Noctua 1600 ATX 3.1

i'm trying to run OC and UV on the CPU but my temps don't drop, in fact i'd say they tend to increase by a couple of degrees..

everything i do in the images.


i found system stability at -15.

first test:

and running cinebench before and after I get lower scores (1262 vs 1228) and higher temperatures (74 average vs 79 average)

I tried to reset the bios with cmos, reset the default values and after reboot try to test again

second test:
this time the score is higher (1370 vs 1271) but the temps tend to be higher by about 1/2 degrees (78 average vs 80 average)

at this point I run a test with occt on the cpu:

-I had already run a test with occt a few weeks ago, when I still hadn't matured the idea of running oc and uv (so with default bios), and the maximum temps reached 78/80 degrees.

-in this last occt the temps are constantly fixed at 85 (maximum limit set in the bios)

p.s. my 9800x3d runs a temp spike that varies from boot to boot that goes from 75 to 85 degrees. this happens every time i start the pc and the desktop is displayed. this spike lasts a few seconds and then returns to standard idle temp, which in my case is from 45 to 55.

ps 2: my 9800x3d does not deny that it always shows fluctuating temps in idle, never a fixed temp.

ps 3. my ryujin iii extreme shows on the display a temp of about 10 degrees less than the temps that i read on hwmonitor

i ask for your help

 

[TerryLaze]

Does the bios have PBO enabled?!
PBO will boost up to the max temp the CPU can stand so undervolting will give it a little higher boost but the same max temp.

 

[AndGarP7]

the system, including the bios is updated to the latest versions,

I also tried removing/adding the Expo settings for the ram, but it doesn't seem to affect this situation in any way

 

[AndGarP7]

Does the bios have PBO enabled?!
PBO will boost up to the max temp the CPU can stand so undervolting will give it a little higher boost but the same max temp.

clearly my goal would be to lower the temp without losing performance, and indeed if you get some more performance it is welcome, but not essential, can you help me?

well if I go to modify the parameters on advanced pbo, I think it is necessarily enabled .. or not?

 

[TerryLaze]

clearly my goal would be to lower the temp without losing performance, and indeed if you get some more performance it is welcome, but not essential, can you help me?

well if I go to modify the parameters on advanced pbo, I think it is necessarily enabled .. or not?

No, PB is normal turbo and should be enabled, PBO is overclocking and if you want it on then your CPU will be hot unless your cooling can brute force the heat.

 

[naczelnik5]

clearly my goal would be to lower the temp without losing performance, and indeed if you get some more performance it is welcome, but not essential, can you help me?

well if I go to modify the parameters on advanced pbo, I think it is necessarily enabled .. or not?

This processor behavior is typical for newer x3d processors. I have a 7800x3d and I know exactly what you are talking about, my processor behaves exactly the same. In these chips, a negative offset does not affect lower temperatures. Setting the limit to 85 does not either because the processor will strive to work at 85C in synthetic tests or under very heavy load. Temperature spikes (caused by spikes in processor usage) are also normal. In general, these processors are designed differently, they achieve the best performance at high temperatures in the case of the 9800x3d it is max 95C. So your temperatures are completely normal and safe. In the case of my 7800 it is max 89C. In Cinebench I have max 85C in games 75C max so there is still a margin. So basically you do not have to do anything about temperatures because they are fine. However, if you really care about lowering temperatures, try manually setting PPT to 75w. For me, only this setting worked on temperatures and in cinebench I had 78C with performance practically the same as factory

 

[AndGarP7]

No, PB is normal turbo and should be enabled, PBO is overclocking and if you want it on then your CPU will be hot unless your cooling can brute force the heat.

thanks for the reply, could I ask you if you can help me with the settings?

I would just like to lower and stabilize the temperatures a bit, without losing performance...

 

[AndGarP7]

This processor behavior is typical for newer x3d processors. I have a 7800x3d and I know exactly what you are talking about, my processor behaves exactly the same. In these chips, a negative offset does not affect lower temperatures. Setting the limit to 85 does not either because the processor will strive to work at 85C in synthetic tests or under very heavy load. Temperature spikes (caused by spikes in processor usage) are also normal. In general, these processors are designed differently, they achieve the best performance at high temperatures in the case of the 9800x3d it is max 95C. So your temperatures are completely normal and safe. In the case of my 7800 it is max 89C. In Cinebench I have max 85C in games 75C max so there is still a margin. So basically you do not have to do anything about temperatures because they are fine. However, if you really care about lowering temperatures, try manually setting PPT to 75w. For me, only this setting worked on temperatures and in cinebench I had 78C with performance practically the same as factory

thanks for answering me,

what are the steps to do in the bios for these settings?

 

[naczelnik5]

thanks for answering me,

what are the steps to do in the bios for these settings?

I don't know exactly what function layout you have in your BIOS. In my its in AMD Overclocking tab.Search in BIOS Precision Boost Overdrive settings.In PBO advanced settings you should be PPT settings. Set to manual and enter 75 if the value is in W or if the board gives in mW then 75000

 

[AndGarP7]

I don't know exactly what function layout you have in your BIOS. In my its in AMD Overclocking tab.Search in BIOS Precision Boost Overdrive settings.In PBO advanced settings you should be PPT settings. Set to manual and enter 75 if the value is in W or if the board gives in mW then 75000

thanks, I'll try and update here...

while regarding the temp reading on the aio display is it normal that it is 10 degrees less than hwmonitor?

 

[naczelnik5]

thanks, I'll try and update here...

while regarding the temp reading on the aio display is it normal that it is 10 degrees less than hwmonitor?

Maybe the readings is from different sensor. For monitoring the best soft is HWiNFO