GPU undervolting reduces the voltage your GPU uses at a given clock speed. Done correctly, it delivers the same performance with 10–20°C lower temperatures, quieter fans, and lower power consumption. Unlike overclocking, undervolting rarely causes instability — the worst case is a driver crash that requires a reboot.

Why Undervolt?

Modern GPUs (NVIDIA RTX 40-series, AMD RX 7000-series) run at voltages higher than necessary for stability. Manufacturers add headroom to ensure every chip from the production run is stable. Your specific GPU might be able to run identically at 50–100mV less than the stock setting.

Benefits:

Lower temperatures: 10–25°C drop typical under sustained load
Quieter operation: fans don’t need to spin as fast
Lower power draw: 15–30W savings typical
Longer GPU lifespan: lower temps = less thermal stress on solder joints

Tools Required

MSI Afterburner (free, works on all GPU brands)
3DMark or a game for stability testing
HWiNFO64 for monitoring temperatures and clock speeds

NVIDIA RTX Undervolting

NVIDIA uses a “voltage/frequency curve” editor in Afterburner.

Step 1: Find your current operating point

Open MSI Afterburner → click the Voltage/Frequency Curve icon (graph icon)
Run a benchmark or game while monitoring HWiNFO64
Note your GPU’s max stable voltage under load (x-axis) and corresponding clock (y-axis)
- Example: RTX 4080 might run at 1.05V / 2850 MHz

Step 2: Set a lower voltage target

In the Voltage/Frequency curve editor:

Ctrl+A: locks all points together for simultaneous movement
Find the frequency point matching your target clock (e.g., 2700 MHz)
Click and drag that single point upward to your target clock while ensuring all points to the right are at or below that clock value

Alternative method (simpler):

In Afterburner main window: reduce Core Voltage slider to -80mV to -100mV
Set Core Clock to 0 (no manual offset)
Apply and test

Step 3: Lock the curve (the correct approach)

Using the curve editor:

Press Ctrl+A to select all points
Move them all down to a lower voltage (e.g., from 1050mV to 975mV)
Now manually pull up the 975mV point to your target maximum clock speed
Apply (checkmark)

This prevents the GPU from boosting above your chosen clock/voltage pair.

AMD RX 7000-Series Undervolting

AMD undervolting works differently — you set a target voltage and clock directly.

Using Afterburner

Enable AMD compatibility in Afterburner settings
Reduce the Core Voltage slider by 50–100mV
Apply and test stability

Using AMD Adrenalin Software

Open AMD Software: Adrenalin Edition
Performance → Tuning → Manual
Enable Advanced Control
Set GPU Clock to a fixed value (e.g., 2700 MHz for RX 7900 XTX)
Set GPU Voltage to a target below stock

Stability Testing

After each voltage reduction, test stability:

Quick test (15 min): Run Unigine Superposition at 1080p Extreme
Proper test (1 hour): Run 3DMark TimeSpy loop or Time Spy Extreme
Gaming test: Play a GPU-intensive game for 30–60 minutes

If the display driver crashes (black screen momentary, then recovery), the voltage is too low. Increase by 25mV and retest.

If the PC hard crashes (no recovery, requires restart), immediately stop and increase voltage more significantly.

Expected Results by GPU

GPU	Stock Voltage	Target Voltage	Temp Reduction
RTX 4090	1.05V	0.90–0.95V	15–25°C
RTX 4080	1.05V	0.90–0.95V	12–20°C
RTX 4070	1.05V	0.87–0.93V	10–18°C
RX 7900 XTX	1.15V	1.00–1.05V	10–20°C
RX 7800 XT	1.1V	0.95–1.0V	10–15°C

Silicon lottery applies — some chips undervolt dramatically, others barely move.

Saving the Profile

In MSI Afterburner, save your profile to one of the profile slots (1–5) and enable Start with Windows so settings apply automatically.

Check the Apply overclocking at system startup option in Afterburner settings.

Combining with Fan Curve

A custom fan curve maximizes the benefit of undervolting:

In Afterburner → Fan section → click the fan curve icon
Draw a steeper curve: start spinning at 40°C (0% otherwise), reach 100% at 85°C
With undervolting, your GPU may never pass 70°C, keeping fans near-silent

Troubleshooting

Game crashes after undervolt: Too aggressive. Increase voltage by 25mV increments until stable.

Clock speeds lower than expected: The undervolt point you chose may not be stable at that frequency. Lower the target clock slightly.

Afterburner settings not applying: Make sure Afterburner is set to run at startup with administrator privileges.

NVIDIA Founders Edition “grey” voltage area: NVIDIA locks voltage control below a certain point on some FE cards. Third-party cards (ASUS, MSI, EVGA) have full voltage control.

Undervolting is one of the best quality-of-life improvements for any gaming PC — a cooler, quieter GPU with identical performance is unambiguously better.