Why Is My GPU Running Hot? Causes and Fixes

What temperature is normal for a GPU?

Before fixing anything, know what you’re actually dealing with. Most people who think their GPU is running hot are within normal operating range.

Modern GPUs are designed to operate up to around 83–90°C and will throttle clock speeds automatically before causing damage. That said, running consistently above 85°C shortens component lifespan and causes performance loss. If you’re above 90°C under gaming load, something needs to change.

How to check your GPU temperature:

• MSI Afterburner (free) — most detailed, shows temperature over time
• GPU-Z (free) — simple and accurate
• Nvidia GeForce Experience — built in if you have an Nvidia card
• AMD Adrenalin Software — built in if you have an AMD card
• Task Manager → Performance → GPU (basic, but works)

The most common causes of high GPU temperatures

1. Dust buildup

The single most common cause of high GPU temperatures, especially on PCs that are 1–2 years old. Dust accumulates on heatsink fins and fan blades, blocking airflow and insulating heat. A GPU that ran at 75°C when new can creep up to 90°C+ after 18 months of use without cleaning.

How to fix it:

Power off and unplug your PC. Remove the GPU from the case. Use compressed air to blast dust out of the heatsink fins — blow from multiple angles, not just straight in. Clean the fan blades individually if they’re visibly coated. Reinstall and test.

This is free, takes 10 minutes, and often drops temperatures by 10–15°C immediately.

2. Poor case airflow

Your GPU generates significant heat that needs somewhere to go. If your case doesn’t have adequate airflow — intake fans at the front, exhaust at the rear and top — hot air builds up inside and your GPU has to work harder to shed heat into an already-warm environment.

How to fix it:

Check your case fan configuration. The baseline is at minimum one intake fan (front) and one exhaust fan (rear). If you have fans but they’re all exhausting or all intaking, rebalance them — more intake than exhaust creates positive pressure which reduces dust buildup and improves GPU cooling.

Check for airflow obstructions. Cables routed through the GPU’s airflow path are a common problem. Tie them back, route them behind the motherboard tray if possible.

Check that your case has adequate ventilation. Cases with solid front panels and no mesh have significantly worse airflow than mesh-front designs. If your case has a solid front panel and high GPU temperatures, this may be a fundamental limitation.

If you need case fans:

A pair of 120mm or 140mm intake fans in the $15–$25 range will meaningfully improve airflow. Check our best PC case for airflow guide if you’re considering a case upgrade.

3. Dried or degraded thermal paste

GPU thermal paste — the compound between the GPU die and the heatsink — degrades over time. After 3–5 years it can dry out, crack, or separate, dramatically reducing thermal conductivity. A GPU that was perfectly cool at launch can develop high temperature problems years later purely from dried paste.

Signs this is your problem:

• GPU is 3+ years old
• Temperatures have gotten noticeably worse over time
• Dust cleaning didn’t help much

How to fix it:

Repasting a GPU is more involved than repasting a CPU — you need to remove the GPU cooler, which usually requires removing several screws on the back of the card and disconnecting fan headers. It’s not difficult but it’s fiddly. Search for your specific GPU model + “repaste guide” for step-by-step instructions — iFixit and YouTube have guides for most popular cards.

Use quality thermal paste — Thermal Grizzly Kryonaut or Arctic MX-6 are reliable choices. Apply a small pea-sized amount to the center of the die and let the heatsink spread it when you reinstall.

4. Aggressive fan curve

Most GPUs ship with conservative fan curves — the fans don’t spin up aggressively until the GPU is already hot, which keeps things quiet but allows higher temperatures. You can override this with a custom fan curve that spins fans faster at lower temperatures.

How to fix it with MSI Afterburner:

1. Open MSI Afterburner and click the fan curve icon (looks like a graph)
2. Enable custom fan curve
3. Drag the curve points so fans hit 60–70% speed at 70°C instead of waiting until 80–85°C
4. Apply and test

This trades some noise for meaningfully lower temperatures. A well-tuned fan curve can drop GPU temps by 5–10°C with no other changes. It’s free and reversible.

5. Inadequate GPU cooler (reference cards)

Reference design GPUs — cards sold directly by Nvidia or AMD without aftermarket coolers — often have less aggressive cooling than AIB partner cards from ASUS, MSI, Gigabyte, or Sapphire. If you’re running a reference blower-style card, it will run hotter than a card with a triple-fan cooler from a board partner.

This is less common in 2026 as most GPUs sold at retail are AIB partner cards, but worth knowing if you bought a Founders Edition or reference card.

The fix is ultimately a replacement GPU with better cooling, or an aftermarket GPU cooler if one exists for your specific card model. Check our GPU upgrade guide if you’re considering this route.

6. Ambient temperature

A PC in a hot room will run hotter than a PC in an air-conditioned room — this sounds obvious but it’s genuinely impactful. GPU temperatures are relative to ambient temperature. A GPU that runs at 78°C in a 20°C room will run at 88°C in a 30°C room with everything else equal.

What to do:

• Improve room ventilation if possible
• Don’t enclose your PC in a desk cabinet with no airflow
• Keep the PC off carpet where possible — carpet traps heat and restricts bottom-mounted intake fans
• In summer, a small fan pointed at the back of the case can drop temperatures noticeably

7. GPU is undersized for the workload

If your GPU is running hot doing normal gaming tasks, the above causes are almost certainly the culprit. But if you’re running intensive workloads — 4K rendering, video encoding, mining, or extended stress tests — some heat is simply a function of the card working hard.

Check whether your temperatures are within the normal range for your specific card under load. Every GPU model has a typical temperature range — search “[your GPU model] normal temperature” to find what other users report. If you’re in line with community reports, your card is fine.

Undervolting — the most effective free fix

If cleaning, airflow improvements, and fan curves haven’t brought temperatures to where you want them, undervolting is the most powerful free tool available.

Undervolting reduces the voltage your GPU uses while maintaining its clock speed. Less voltage = less heat, lower power draw, and often the same or better performance. It’s free, reversible, and safe.

How to undervolt with MSI Afterburner:

1. Open MSI Afterburner and press Ctrl+F to open the voltage/frequency curve editor
2. Find your GPU’s current maximum clock speed on the curve
3. Select all points above that clock speed and drag them down
4. Find the voltage point that corresponds to your target clock and flatten the curve there
5. Apply, save, and run a stress test (Unigine Heaven or 3DMark) to verify stability

A good starting point is reducing voltage by 50–100mV at your current max clock. If it’s stable, try more. If it crashes, add voltage back in small increments until stable.

A successful undervolt typically drops GPU temperatures by 5–15°C and reduces power draw by 15–30W. It’s one of the best things you can do for a hot-running GPU short of hardware changes.

When to actually worry

Most high GPU temperatures are fixable with the steps above. There are a few situations where you should act urgently:

Temperatures above 100°C — most GPUs will throttle or shut down before reaching this but if you’re seeing it, stop gaming immediately and diagnose before continuing.

Sudden temperature spikes — if your GPU was running fine and suddenly runs 20°C hotter without any changes, a fan may have failed. Check that all GPU fans are spinning. A failed fan on a dual or triple-fan card will cause rapid temperature increases.

Thermal throttling confirmed — if MSI Afterburner shows your GPU clock speed dropping during gaming, your GPU is throttling. The performance loss is real. Fix the temperature before it becomes a hardware damage issue.

Burning smell — obvious, but if you smell burning, power off immediately.

The fix checklist

Work through these in order:

• Check actual temperatures with MSI Afterburner or GPU-Z
• Verify temperatures are actually above normal range for your card
• Clean dust from heatsink and fans with compressed air
• Check case fan configuration — intake at front, exhaust at rear
• Set a custom fan curve in MSI Afterburner
• Clear cable obstructions from GPU airflow path
• Undervolt GPU in MSI Afterburner
• Check ambient room temperature
• If PC is 3+ years old — consider repasting

If nothing works — hardware upgrade time

If you’ve worked through every fix above and your GPU is still thermal throttling, you’re either dealing with a failing GPU or a fundamentally inadequate cooling setup that can’t be fixed without new hardware.

A new case with better airflow is often the cheapest fix at this point. Check our best PC case for airflow under $80 guide for current picks.

If the GPU itself is aging and running hot despite clean fans and good airflow, it may be approaching end of life. Check our GPU upgrade guide and best GPU under $300 guide for current replacement options.

Running into other PC problems? Check our full troubleshooting guides or see our how to fix stuttering guide if high temperatures are causing in-game performance issues.