Help with Ryzen 5 PRO Voltage

[shahaan]

TL;DR I want to set CPU voltage as low as possible while maintaining the default/stock performance of the CPU, but idle voltage seems higher than it should be.

 

Hey folks, I need a little help wrapping my head around CPU voltages and setting the desired voltage in BIOS.

 

The hardware is an AMD Ryzen 5 PRO 4650G (3.7Ghz base, 4.2Ghz boost, 65W TDP) on an Asus TUF Gaming B550M-Plus.

 

From HWiNFO64:

 

Core VIDs

 

CPU Core Voltage (SVI2 TFN)

 

CPU Core VID (Effective)

 

HWiNFO64 tool tips on each of the above readouts:

• Core VIDs: "Voltage requested by particular core, not the voltage really supplied by voltage regulator."
• CPU Core Voltage (SVI2 TFN): "Voltage of the core domain (VDDCR_CPU) provided via Voltage Regulator telemetry (SVI2 TFN)."
• CPU Core VID (Effective): "Effective voltage requested. This is the voltage among all core VID voltages requested chosen as the final request to the VR."

 

BIOS settings:

• VDDCR CPU Voltage: Offset Mode
• VDDCR CPU Offset Voltage: -0.13750
• VDDCR CPU Load Line Calibration: Level 2

 

If I understand the HWiNFO readouts correctly, the SVI2 TFN readings are "actual/real" CPU voltages. What I don't understand is why the idle voltage is sitting so high (1.319 V) when I've set a sizeable negative offset.

 

Any help will be greatly appreciated! Thanks!

[shahaan]

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