What temperature is too hot for a PC CPU?

Under full gaming load, CPU temperatures above 90°C are a concern. Most modern CPUs will throttle performance to protect themselves above 95–100°C. Idle temperatures above 50°C usually indicate a cooling problem.

Why does my PC overheat only when gaming?

Gaming places sustained load on both CPU and GPU simultaneously. If your PC only overheats under this specific load, the issue is almost always inadequate airflow or dried-out thermal paste rather than a hardware fault.

How often should I clean dust from my PC?

Every 6–12 months in a clean environment, every 3–6 months in a dusty one (near pets, carpet, or on the floor). A 10-minute clean with compressed air is the single best preventive maintenance you can do.

Can overheating permanently damage my PC?

Prolonged operation above safe temperatures degrades component lifespan. Modern CPUs and GPUs throttle before reaching damage thresholds, but chronic thermal throttling significantly reduces performance. Fix overheating issues promptly.

When should I take my overheating PC to a professional?

If temperatures remain high after cleaning, checking airflow, replacing thermal paste, and verifying fan operation, the cooler itself may be failing or the case may simply be inadequate for the hardware. Eagle Gaming offers PC rebuild and cooling upgrade services from $149.

PC Overheating? 7 Practical Fixes to Try at Home

By Joel Mikkelsen, Owner — Eagle Gaming | Updated 30 March 2026 | 6 min read

Most overheating problems have simple causes: dust, blocked airflow, or dried-out thermal paste. Before spending money on new hardware, work through these seven checks in order. Most people fix the problem at step 2 or 7.

Before You Start: Check Your Temperatures

Download HWMonitor (free from CPUID) or HWiNFO64 and run it while doing whatever causes your PC to overheat — usually gaming or rendering. Note the peak temperatures for CPU and GPU.

CPU under full load: Below 90°C is acceptable. Above 95°C is a problem.
GPU under full load: Below 85°C is normal. Above 90°C needs attention.
CPU at idle: Should be below 45–50°C. Above that suggests a cooling issue even at rest.

Fix 1: Clean the Dust

This fixes the problem for most PCs over 18 months old. Shut down completely, unplug the power cable, and use a can of compressed air to blow dust out of:

All front, bottom, and side intake vents
Rear and top exhaust vents
CPU heatsink fins (blow across the fins, not into them)
GPU heatsink and fan blades
PSU intake vent (bottom or rear depending on your case)

Do this outside or over a bin — the dust that comes out can be substantial.

Fix 2: Check Case Fan Airflow Direction

Every fan has a front and a back — air exits from the front (label side on most fans). The correct layout for almost all cases:

Front and bottom: Intake (pulling air in from outside)
Rear and top: Exhaust (pushing hot air out)

A single reversed fan can cancel out two correctly-oriented ones. Check each fan's arrow markings and confirm direction with your hand.

Fix 3: Sort Your Cable Management

Cables running through the main chamber block the airflow path from front intake to rear exhaust. Route as many cables as possible behind the motherboard tray. Even a rough tidy-up helps. The goal is a clear lane of airflow from front to back.

Fix 4: Check Your BIOS Fan Curves

Restart your PC and enter BIOS (usually Delete, F2, or F10 on startup — check your motherboard manual). Navigate to the fan control settings and check the CPU fan curve profile. If it's set to Silent, the fan is being speed-limited even under heavy load. Change it to Standard or Performance, save, and reboot.

Fix 5: Verify All Fans Are Spinning

With the side panel off and the PC running under load, visually confirm every fan is spinning — including case fans, the CPU cooler fan, and GPU fans. GPU fans on some cards don't spin at low temperatures (semi-passive mode), so give the GPU a workload first. A dead fan is obvious once you're looking for it.

Fix 6: Move the PC Off the Floor (or Carpet)

PCs on carpet restrict bottom-panel intakes and accelerate dust accumulation. Move the PC to a hard surface or raise it on a small stand so the bottom vents have clearance. This is a free fix that makes a noticeable difference.

Fix 7: Replace the CPU Thermal Paste

Thermal paste between the CPU and its cooler dries out over 2–4 years, losing thermal conductivity. This is the most common cause of CPU overheating in PCs that were previously fine.

What you need: isopropyl alcohol (90%+), a lint-free cloth or coffee filter, and Arctic MX-4 thermal paste (widely available at Scorptec, PLE, or MSY in Australia).

Shut down and unplug
Remove the CPU cooler (4 screws on most Intel mounts; AMD AM5 uses a different bracket)
Clean both the CPU lid and cooler base with isopropyl alcohol until all old paste is gone
Apply a pea-sized drop of fresh paste to the centre of the CPU lid
Reinstall the cooler and tighten screws in a diagonal pattern (not clockwise) to ensure even pressure
Boot and check temperatures

If done correctly, this typically drops CPU temperatures by 10–20°C.

When to Call a Professional

If you've worked through all seven fixes and temperatures are still problematic, the issue is likely a failing cooler, inadequate cooler for the CPU's TDP, or a case that's simply too small for the hardware. Eagle Gaming offers a PC Rebuild Service from $149 that includes a full thermal overhaul — new paste, cleaned heatsinks, cable management, and a cooling review.

Frequently Asked Questions

What temperature is too hot for a PC CPU?: Under full gaming load, CPU temperatures above 90°C are a concern. Most modern CPUs will throttle performance to protect themselves above 95–100°C. Idle temperatures above 50°C usually indicate a cooling problem.
Why does my PC overheat only when gaming?: Gaming places sustained load on both CPU and GPU simultaneously. If your PC only overheats under this specific load, the issue is almost always inadequate airflow or dried-out thermal paste rather than a hardware fault.
How often should I clean dust from my PC?: Every 6–12 months in a clean environment, every 3–6 months in a dusty one (near pets, carpet, or on the floor). A 10-minute clean with compressed air is the single best preventive maintenance you can do.
Can overheating permanently damage my PC?: Prolonged operation above safe temperatures degrades component lifespan. Modern CPUs and GPUs throttle before reaching damage thresholds, but chronic thermal throttling significantly reduces performance. Fix overheating issues promptly.
When should I take my overheating PC to a professional?: If temperatures remain high after cleaning, checking airflow, replacing thermal paste, and verifying fan operation, the cooler itself may be failing or the case may simply be inadequate for the hardware. Eagle Gaming offers PC rebuild and cooling upgrade services from $149.