Editing the voltage curve in MSI Afterburner lets you undervolt or overclock your GPU by adjusting voltage-frequency points and flattening the curve beyond your target.
Most GPU tuning guides skip the one graph that actually controls heat and performance together. The voltage curve in MSI Afterburner does both at once, but only if you know which shortcuts adjust it, how to flatten the tail, and what to do when the editor won’t cooperate. Learning how to edit voltage curve in MSI Afterburner means fewer degrees under load, quieter fans, and clock speeds that hold steady instead of bouncing off a power limit.
What Is the Voltage Curve Editor in MSI Afterburner?
The voltage curve editor is a graph inside MSI Afterburner that maps every possible voltage your GPU can request to the clock speed it runs at that voltage. Each dot on the curve is a voltage-frequency pair, and the line connecting them tells the driver what speed to target at each power state.
By editing which frequency runs at which voltage — and flattening the dots beyond your chosen point — you can run the same clock speed at a lower voltage (undervolting) or push a higher speed at the same voltage (overclocking). MSI’s official guide uses this editor for both tasks, and the same curve handles either outcome depending on how you adjust it.
How to Enable the Voltage Curve Controls
Before the curve editor responds to any click, two checkboxes in MSI Afterburner’s settings usually need to be turned on. Open Settings > General and enable Unlock voltage control and, if present, Unlock voltage monitoring. Restart MSI Afterburner after checking those boxes. The core voltage slider and the curve editor button should now be active.
On some GPU models the curve editor appears accessible without this step, but the most common “buttons are grayed out” fix across forums and video walkthroughs is that exact reboot after enabling voltage control.
Editing the Voltage Curve in MSI Afterburner: The Step Order That Works
MSI’s own workflow calls for opening the curve editor with Ctrl+F, adjusting the curve, clicking Apply, and saving the result to a profile. The fuller sequence that covers both undervolting and basic curve shaping looks like this.
- Open MSI Afterburner and press Ctrl+F to open the curve editor.
- Resize the curve window by clicking and dragging its edges so you can see the full voltage range from roughly 700 mV to 1200 mV.
- Click on the voltage point you want to start from — 950 mV is MSI’s example target for a typical undervolt.
- Drag that point up to the frequency you want the GPU to hold at that voltage. A modest target is the stock boost clock of your card, or roughly 50–100 MHz above it.
- Select every point to the right of the one you just moved. Click the first point, hold Shift, and click the last point at the far right end of the curve.
- Press Shift+Enter to flatten the selected points. The line to the right of your target should now be horizontal at the same frequency you set.
- Click Apply in the main Afterburner window. The curve locks in immediately.
- Open Settings > Profiles, choose a profile slot (1–5), and click Save. If you want this curve active every time Windows starts, enable Apply at Windows Startup.
The exact procedure from MSI’s official overclocking and undervolting guide confirms the curve-editor steps and the profile-saving sequence.
Curve Editor Shortcuts and Functions
MSI’s guide documents several shortcuts that make curve editing faster. The table below covers the essential ones and what each does.
| Shortcut | Function | Notes |
|---|---|---|
| Ctrl+F | Open the voltage curve editor | Works from the main Afterburner window |
| Click + drag point | Select and move a single voltage-frequency dot | Core editing action for all curve changes |
| Shift+Enter | Flatten all selected points to the same frequency | MSI official method for capping voltage |
| Alt+drag | Move the entire curve up or down | Used for broad adjustments |
| Ctrl+drag | Adjust the lower end of the curve independently | Useful for fine-tuning idle/low-load behavior |
| L | Lock GPU voltage and frequency to the highlighted dot | Press L again to unlock dynamic scaling |
| Resize window edges | Expand the curve editor view | Needed when the full voltage range isn’t visible |
How to Undervolt a GPU Using the Curve Editor
Undervolting is the most common reason people open this editor. The goal is to run your normal gaming clock speed at a lower voltage, which drops temperature and fan noise without losing performance.
Start around 925 mV. Click that dot and drag it up to your card’s typical boost frequency — say 1800 MHz for a mid-range GPU. Select all dots to the right of 925 mV and press Shift+Enter to flatten them at 1800 MHz. Click Apply and test with a game or benchmark. If it holds stable for 5 minutes without crashes or artifacts, you can try lowering the voltage to 900 mV while keeping the same frequency. Drop in small steps — 12–25 mV at a time — and test each one before going lower.
MSI’s guide recommends testing with a game benchmark or Furmark for roughly 5 minutes and comparing GPU clock, memory clock, voltage, temperature, and FPS before and after the curve edit. If the system crashes or shows visual artifacts, return to the last voltage point that ran cleanly.
How to Test and Verify Curve Stability
Every curve change needs a stability check before you save it to a profile. Run a GPU-intensive game or a benchmark loop for at least five minutes. Watch for frame stutters, artifacts, sudden FPS drops, or a complete system lockup. MSI’s guidance specifically calls out checking 1% low framerates — a stable undervolt should not make those worse.
If the test passes, save the curve to a profile slot and note the voltage and frequency values in your own records. If it fails, increase the voltage slightly or reduce the target frequency until stability returns. The last working point before a crash is your limit.
Troubleshooting Common Curve Editor Problems
Even with the right steps, the curve editor sometimes misbehaves. The table below covers the issues that show up most often.
| Issue | Likely Cause | Fix |
|---|---|---|
| Curve editor buttons are grayed out | Voltage control not unlocked in settings | Enable Unlock voltage control in Settings > General, then restart Afterburner |
| Curve resets after clicking Apply | Power Limit% or Core Voltage% not at default values | Set Power Limit% to 100 and Core Voltage% to 0 |
| Shift+Enter does nothing | Selection does not cover all points to the right | Extend the selection farther right before pressing Shift+Enter again |
| System crashes after applying a curve | Voltage too low or frequency too high for the selected voltage | Return to the last stable voltage point and reduce the adjustment |
| GPU voltage still exceeds the target | Points beyond the target were not flattened | Re-select all points to the right and press Shift+Enter to flatten them |
| GPU stays locked at one clock speed | The L key was pressed, locking voltage and frequency | Press L again to unlock dynamic voltage/frequency scaling |
| Curve reverts after restarting the PC | Profile was saved but auto-apply is off | Save the curve to a profile and enable Apply at Windows Startup in settings |
Final Checklist for Editing the Voltage Curve
Before you close MSI Afterburner, run through this short list to confirm your curve is saved and stable.
- Voltage control is unlocked in Settings > General, and Afterburner has been restarted.
- The curve is open with Ctrl+F and fully visible after resizing the window.
- The target voltage point has been dragged to the desired frequency.
- All points to the right of the target are flattened with Shift+Enter.
- Power Limit% is at 100 and Core Voltage% at 0 before clicking Apply.
- A 5-minute game or benchmark test ran without crashes, artifacts, or FPS drops.
- The curve has been saved to a profile slot.
- Apply at Windows Startup is enabled if you want the curve active on every boot.
One wrong point in the curve can cause a crash at the worst moment, but the editor is forgiving — you can always reopen Ctrl+F, click a different dot, and try again. Start conservatively, test each step, and the result is a GPU that runs cooler on the same workload.
References & Sources
- MSI. “MSI Afterburner Overclocking and Undervolting Guide.” Official blog post covering curve editor workflow, shortcuts, and testing recommendations.