New Strix G16 w/Intel 275HX - Unable to Undervolt outside of BIOS

[kailing]

Is there anyway to allow undervolting via XTU or Throttlestop with these laptops? No matter what I change in BIOS, XTU says that Undervolt Protection is active. BIOS stops at a -30mv and I'd really like to see if I can get away with -100mv or more to bring down temps and increase clocks.

[ElectroStingz]

Hello,

Uninstall XTU and once done restart Windows.

Then on next power up load your default settings in the BIOS, Save and exit.

Re-enter the BIOS, change the Intel VT-D setting to disabled.

Get into Windows and use Throttlestop v9.7.3, go to the FIVR section and see if you can enable the voltage setting and choose an offset voltage.

Also is this Windows 24H2 or 25H2?

The memory integrity option / Core isolation should be off when you have the VT-D option disabled but double check them in Windows. XTU only runs with those off anyway so if that is working its not the problem. 

Could be that the Windows settings with XTU are not working for some reason and causing the laptop to prevent undervolting. So sometimes a bios reset / clearing the laptop EC can help, like when its off with the power connected you hold the power button down for 30-40s and wait until the power light stops flashing.

[Zalevskiy]

maybe UMAF advanced bios support

[hariiee]

I faced the same issue with my Strix G16 275HX. Intel has locked undervolting on newer CPUs via XTU and ThrottleStop, so the BIOS limit at -30mV is currently the maximum you can safely apply. One workaround is to optimize CPU temps and power limits directly in BIOS, and use custom fan curves to reduce thermal throttling without pushing voltages beyond safe limits.

[robertlerry]

Hey! I know the struggle . On the G16 275HX, undervolting beyond the BIOS limits isn’t allowed due to Intel’s protection. What helped me was adjusting power limits and fan profiles inside BIOS, and monitoring temps in real-time. This way you can get better clocks and lower temps safely without risking CPU stability.