How to Overclock Your GPU Safely: MSI Afterburner Step-by-Step Guide

Overclocking your GPU adds 5-15% more FPS for free using MSI Afterburner. The process is safe – modern GPUs have built-in protections that prevent damage from software overclocking. Increase core clock by 25MHz at a time, test stability, and repeat until you find the limit. A typical overclock takes 30-45 minutes of testing and gives you performance equivalent to upgrading one GPU tier without spending money. For a broader overview, see our complete guide to fixing gaming PC problems.

Before You Start: What You Need

• MSI Afterburner (free, works with all GPU brands – NVIDIA, AMD, Intel)
• A benchmark tool: Unigine Heaven (free), 3DMark (free demo), or a demanding game you play regularly
• A temperature monitor: MSI Afterburner includes one, or use HWMonitor alongside it
• 30-45 minutes of time for the full overclocking and testing process

Set Up MSI Afterburner

1. Download from the official MSI website (msi.com)
2. Install with RivaTuner Statistics Server (RTSS) checked – this enables the on-screen display
3. Open Afterburner and familiarize yourself with the interface: sliders for Power Limit, Core Clock, Memory Clock, and Fan Speed

Step 1: Increase Power Limit

The Power Limit slider allows the GPU to draw more power from the PSU. By default, GPUs are limited to their rated TDP. Increasing the power limit lets the GPU sustain higher clock speeds without throttling.

Push the Power Limit slider to maximum (typically +10-15%). Also push the Temperature Limit slider to maximum if available. Click Apply (checkmark button).

This is completely safe. You are not increasing voltage or forcing the GPU beyond its electrical design limits – you are simply allowing it to use its full rated power capacity instead of artificially limiting it.

Step 2: Overclock Core Clock

The core clock determines how fast the GPU processes graphics calculations. Higher core clock = more frames per second.

1. Increase Core Clock by +25MHz
2. Click Apply
3. Run a benchmark (Unigine Heaven or a game) for 10 minutes
4. Watch for: crashes, driver errors, visual artifacts (flickering, colored dots, corrupted textures)
5. If stable: increase by another +25MHz and repeat
6. If unstable: back off by 25-50MHz from the crash point

Typical results by GPU generation:

Silicon lottery matters: Two identical GPU models can overclock differently. One RTX 4070 might hit +200MHz stable while another from the same batch only manages +100MHz. This is normal – semiconductor manufacturing produces varying silicon quality. Do not compare your overclock to others; find your card’s specific limit.

Step 3: Overclock Memory Clock

After finding your stable core clock, increase memory speed for additional performance. Memory overclocking improves texture loading speed and frame buffer performance.

1. Keep your stable core clock applied
2. Increase Memory Clock by +50MHz
3. Click Apply and run a benchmark for 10 minutes
4. Memory instability looks different from core instability: watch for texture corruption, sparkles, or missing textures rather than outright crashes
5. If stable: increase by another +50MHz and repeat
6. If artifacts appear: back off 50-100MHz

GDDR6X memory note (RTX 3080, 3090, 4080, 4090): GDDR6X memory has error correction (ECC) that silently corrects errors at the cost of performance. This means you can push the memory slider very high without seeing visual artifacts, but past a certain point, performance actually decreases because the error correction overhead exceeds the speed gain. Test by running a benchmark at +500MHz, +750MHz, and +1000MHz memory – if the score drops at higher speeds, you have passed the optimal point.

Step 4: Stress Test for Stability

Short 10-minute tests during the tuning process catch obvious instability. A final 30-minute stress test catches marginal instability that only appears once the GPU reaches peak temperature.

1. Set your final Core Clock and Memory Clock offsets
2. Run your most demanding game or Unigine Superposition for 30+ minutes
3. Monitor: GPU temperature (stay under 85C), clock speeds (should remain consistent, not throttling), and frame times (should be smooth, no periodic stutters)
4. If the test completes without crashes, artifacts, or temperature issues, your overclock is stable

Step 5: Save Your Profile

Click the floppy disk icon in MSI Afterburner and save to a profile slot (1-5). You can also check “Apply overclocking at system startup” if you want the overclock to load automatically when your PC boots.

Keep Profile 1 as your overclock and leave the reset button accessible. If a game crashes and you suspect the overclock, one click resets everything to stock.

Advanced: Undervolting (Better Than Overclocking for Most)

Undervolting reduces the voltage your GPU uses at a given clock speed. Less voltage = less heat = less fan noise, while maintaining the same performance. Many gamers find undervolting provides a better experience than overclocking because it makes the GPU run cooler and quieter without sacrificing FPS.

How to Undervolt in MSI Afterburner

1. Open Afterburner and press Ctrl + F to open the voltage-frequency curve editor
2. Find the point on the curve that matches your GPU’s current boost clock (check GPU-Z for the actual boost speed during gaming)
3. Click that frequency point and drag it down by 50-100mV
4. Hold Shift and click to flatten the curve to the right of your selected point
5. Click Apply and test stability with a 30-minute game or benchmark
6. If stable, try reducing voltage by another 25mV

A successful undervolt of 75-100mV reduces temperatures by 5-12C and power consumption by 20-40W with zero performance loss. Some GPUs even boost higher after undervolting because they are no longer hitting thermal limits.

The Auto-OC Scanner (Lazy Method)

MSI Afterburner includes an automatic overclocking scanner that tests your GPU and applies a safe overclock:

1. Open Afterburner > click the OC Scanner button (magnifying glass icon)
2. Click “Scan” and wait 15-20 minutes while it tests different frequencies
3. The scanner applies a custom voltage-frequency curve optimized for your specific GPU
4. Click Apply and save to a profile

The auto scanner typically finds 70-80% of the manual overclocking headroom. It is less optimal than careful manual tuning but takes zero effort and produces a stable result.

Decision Framework

• Want free FPS with minimal effort: Use the auto OC scanner. 5-8% gain in 20 minutes
• Want maximum performance gain: Manual overclock (core + memory + power limit). 8-15% gain in 45 minutes
• Want quieter/cooler GPU with same FPS: Undervolt instead of overclock. Same performance, 5-12C cooler, much quieter
• Want both: Undervolt first, then overclock on top. The undervolt reduces heat, allowing higher stable clock speeds than overclocking alone

2026 update: The RTX 5070 and RX 9070 XT redefined mid-range GPU value. Our GPU guide covers current recommendations.

Frequently Asked Questions

Is overclocking a GPU safe?

Yes. Modern GPUs have built-in protections that prevent damage from software overclocking. The worst outcome is a driver crash or game freeze. You cannot permanently damage a GPU by adjusting clock speeds or power limits through MSI Afterburner.

How much FPS does overclocking a GPU add?

A typical overclock adds 5-15% FPS. Core clock improvements of 100-200MHz give 5-10% gain. Memory adds another 2-5%. Combined, a GPU averaging 90 FPS might hit 100-103 FPS. Modest but free gains.

Does overclocking a GPU void the warranty?

Technically yes per most warranties. Practically, manufacturers cannot detect software-based overclocking. Reset to stock settings before any RMA. Physical modifications (BIOS flash, voltage mods) are detectable and will void warranties.

What temperature is too hot for an overclocked GPU?

Keep under 85C for long-term stability. Under 80C is ideal. Above 90C triggers thermal throttling that negates overclock gains. If hitting 85C+, reduce the overclock or improve cooling.

Should I overclock or undervolt my GPU?

Undervolt first. It reduces heat and noise while maintaining performance. Then overclock on top for maximum gains. Undervolting by 75-100mV drops temps 5-12C with zero performance loss. Some GPUs boost higher after undervolting because they avoid thermal limits.

Related Guides

• How to Monitor GPU Temperature While Gaming
• How to Fix GPU Crashing During Games
• How to Fix GPU Fans Not Spinning
• How to Fix CPU Overheating While Gaming