Lenovo Legion 7 i9-13900HX successful undervolt

[geq]

Thought to share this to other users.

Model: Lenovo Legion 7 16IRX8
i9-13900HX
RTX4070
BIOS VERSION: KWCN42WW

Step 1: Change BIOS setup (press F2 after power on)
- Load defaults
- "Legion Optimization" to Enabled, which will disable virtualization
- "UnderVolt Protection" to Disabled
And then Save and Exit

Step 2: Boot into Windows and adjust ThrottleStop
The "Unlock Adjustable Voltage" should be enabled.

I reached -0.15v for CPU Core, and -0.0479v for CPU cache. The system gets unstable lower than that.

Benefit
At default Balance mode, CPU PKG power is capped at 120 Watt. During TS Bench, P cores can maintain 4200 MHz over previous 4000 MHz. Not a big deal in real life, but who cares.

 

[unclewebb]

-0.0479v for CPU cache. The system gets unstable lower than that.

Have you tried experimenting with the mV Boost feature yet? Setting mV Boost to 150 might allow you to achieve a much bigger P cache undervolt without any stability issues.

Can you also post your TPL settings? This helps other users.