Throttlestop

ThrottleStop / undervolt

ThrottleStop undervolt

ThrottleStop undervolt lives in FIVR (Fully Integrated Voltage Regulator). You do not type a secret voltage on the main screen. You click FIVR, tick Unlock Adjustable Voltage, keep Adaptive selected, and move Offset Voltage negative on CPU Core and CPU Cache by the same amount.

ThrottleStop undervolt: FIVR offset voltage -75.2 mV on CPU Core next to the main monitoring window
Real ThrottleStop undervolt. Core i5-8350U, Offset Voltage -75.2 mV, Adaptive, Unlock Adjustable Voltage checked. Main window still shows VID 1.1426 V and 99°C max - undervolt is not a magic cool-pack if PL1 is still slamming the chip.
ThrottleStop Turbo FIVR Control with CPU Core Adaptive voltage and IccMax
FIVR Control. Planes: CPU Core, CPU Cache, Intel GPU, iGPU Unslice, System Agent. Only touch Core and Cache unless you know why.
Dark ThrottleStop FIVR window with V/F style voltage table
Newer ThrottleStop FIVR (dark chrome) with the voltage table on the right. ThrottleStop 9.7 added core/cache V/F points on unlocked HX and K chips.

How to undervolt CPU in ThrottleStop

  1. Download ThrottleStop, extract, run as administrator.
  2. Save a stock TS Bench or Cinebench R23 number first.
  3. FIVR → CPU Core → Unlock Adjustable Voltage → Adaptive → Offset Voltage -50 mV.
  4. CPU Cache → same -50 mV. Apply. If it does not freeze, OK - Save voltages immediately.
  5. TS Bench or Cinebench. If it blue-screens, boot and reduce the undervolt by 10-15 mV.
  6. Walk it down (-80, -100, -125) only after a night of mixed idle + game + undervolt cpu stress.

Intel GPU offset used to be a casual -50 mV. On a lot of 8th-gen and newer laptops it is more trouble than it is worth. Leave iGPU at 0 if you are not sure.

FIVR Locked / Not Available

If the FIVR window says Not Available or FIVR Control - Locked, that is not a broken ThrottleStop download. Intel removed undervolt from most H-series chips after Plundervolt. Unlocked K and many HX parts still move. H, U, P, and almost every 12th-gen-and-newer thin laptop will not. You still have TPL, Speed Shift, turbo ratio limits and BD PROCHOT.

ThrottleStop FIVR with Extra Voltage, turbo ratio groups and cache ratio
FIVR with Extra Voltage, non-turbo ratio and per-group turbo ratios. If sliders are dead, stop chasing undervolting and open TPL.
ThrottleStop FIVR during a user tuning session
Another live FIVR screenshot from a tuning session. Copying someone else's -125 mV is how you get random idle crashes.

Undervolting lowers heat so the chip can hold FID longer. It is not overclocking. Worst case of too much ThrottleStop undervolt is a freeze, not a fried CPU. Still: Save voltages immediately so a crash does not make you re-enter sliders.