[AMD][VMR/RPL/GNR] Voltage Curve Optimizer

[cyring]

For AMD Vermeer, Raphael and Granite Ridge is introduced the VCO formula as a build argument:

make -j HWM_CHIPSET=AMD_VCO

Remarks:

• without the HWM_CHIPSET argument, the CoreFreq build will fallback to the AMD P-State voltage formula.
• the P-State formula is preferred with EPYC and any platform whom BIOS excludes voltage optimization
• Feature is introduced as a build argument because I don't know any register which could help to switch dynamically to an appropriated voltage algorithm

[cyring]

Contributors

@leinardi [5800X] @LethalManBoob [5800X] [5700X] @thor2002ro [5900X] @Slaviusz [5950X] @WildPenquin [5950X] @ppascher [5950X] @olejon [5950X] @Jon0 [7950X] @KeithMyers [7950X] @amfern [7950X] @tofurky [7950X] @mikealanni [7945X] @madoverlord40 [9950X]

VCO change is available since 85b1e62 in develop branch

If you have chosen the Voltage Optimizer within BIOS option then you have to specify HWM_CHIPSET=AMD_VCO to get an appropriate voltage Core reading.

Please post screenshots of the UI View > Sensors > Voltage in various cases: Idle and Stressed CPU (not showing Menu)

Tips:

• If you don't need the UI bar charts then you can build this way

make -j HWM_CHIPSET=AMD_VCO NO_UPPER=1

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Thanks anyone for helping

[madoverlord40]

Please post screenshots of the UI View > Sensors > Voltage in various cases: Idle and Stressed CPU (not showing Menu)

Do I do this while having curve optimizer active, or not active?

[cyring]

Please post screenshots of the UI View > Sensors > Voltage in various cases: Idle and Stressed CPU (not showing Menu)

Do I do this while having curve optimizer active, or not active?

You do this while having curve optimizer active

[madoverlord40]

Ok so i cleaned and rebuilt with make -j HWM_CHIPSET=AMD_VCO
Im using a CO in bios of -20.

Here is idle voltage view:

All core stress using your software voltage view:

[cyring]

@madoverlord40 Thank you for your tests. CO is really odd: from idle to stress, the VID delta is just about 4 for most cores.
And unfortunately 9950X results don't behave as 7950X ones

VID to voltage formula has to be customized directly in source code and as a function of the curve parameters left in BIOS

CoreFreq/x86_64/coretypes.h

Line 788 in 85b1e62

#define COMPUTE_VOLTAGE_AMD_VCO(Vcore, VID) \

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Now BIOS can be configured with no CO, voltage offset and tweaks. Just the plain P-State. PBO is ok.
A simple make (without HWM_CHIPSET parameter) will now build CoreFreq with standard formula: please let ne know if voltage is accurate

[KeithMyers]

Not using Curve Optimizer. Using per CCX with 52.0/50.5 @ 1.28 VID
Here is idle and stress screenshots under my Boinc load.

[madoverlord40]

I still have CO on and have not testing with it off but as having curve optimizer on at -20 and level 5 CPU LLC in bios, i dont think this voltage is correct?

[cyring]

I still have CO on and have not testing with it off but as having curve optimizer on at -20 and level 5 CPU LLC in bios, i dont think this voltage is correct?

For this screenshot how was made the build ?

[cyring]

Ok so i cleaned and rebuilt with make -j HWM_CHIPSET=AMD_VCO
Im using a CO in bios of -20.

When CO is activated, the VID values in both case, idle and stressed, are so closed that it can't compute the low and high Vcore!

[cyring]

Let me show you what we have with Zen2/Matisse

1. No voltage optimizer or whatever LLC or performance tricks are activated
2. Only PBO, in its default mode, is allowed

• Idle case
  

• All CPUs stressed
  

• Single CPU stressed
  

The VID values (obtained from current P-State register) are inversely proportionate to the frequency

Applying the voltage formula (specified in AMD datasheet), we are getting an accurate voltage (for both CPU and SoC)

---

• Zen1, Zen2 and Zen3

$$Vcore = 1.550 - (0.00625 * VID)$$

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• Zen3+ and Zen4: I have discovered this formula

$$Vcore = 0.00625 * VID$$

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• Zen5: no datasheet available; we have to guess a formula or we can bet a formula same as previous generations, especially when no voltage optimization is enabled.

[madoverlord40]

I still have CO on and have not testing with it off but as having curve optimizer on at -20 and level 5 CPU LLC in bios, i dont think this voltage is correct?

For this screenshot how was made the build ?

I think its still built with HWM_CHIPSET=AMD_VCO.

[madoverlord40]

You know i think these voltages im getting right now are good, not that i know what the formulas should be. But i rebuilt with just -j on develop, and then started to build HLOD in unreal engine 5, and voltages were between 1.29 and 1.36 while boosting. Seeing that i have a CO of -20 and LLC of level 5, its doing well. Even if the voltages are not correct, they are i think quite close!

Yeah, its close, im in RM now during a C++ all core compile, RM is averaging 1.33vcore, you are so close!