The fastest way to check your PC temperature

The simplest method is to use HWiNFO, a free program that displays your CPU and GPU temperatures in real time. Download it from hwinfo.com, run the installer, and open the application — your temperatures appear immediately in the main window. Most people need only this one tool.

If you want something even lighter, Core Temp (alcpu.com) sits in your system tray and shows CPU temperature with a single click. Both programs work on Windows 10 and 11 without requiring administrator setup or configuration.

On a Mac, download Macs Fan Control (crystalidea.com) or Temp Monitor from the App Store. Both show CPU temperature and fan speed in the menu bar.

Key Takeaways

  • HWiNFO and Core Temp are free Windows programs that display CPU and GPU temperatures immediately after installation, with no setup required.
  • Normal CPU temperatures under load are typically 60–80°C; sustained temperatures above 90°C indicate a cooling problem that needs attention.
  • Check temperatures while your PC is under load — running a game or video editor — because idle temperatures do not reveal whether cooling is adequate.
  • High temperatures usually point to dust buildup in fans or vents, a loose cooler, or dried thermal paste between the CPU and cooler.

Understanding what your temperature numbers mean

CPU temperatures vary by processor model, but a general rule is: under load (running a game, video editor, or stress test), temperatures between 60°C and 80°C are normal. Temperatures above 90°C mean your cooling system is struggling. Above 100°C, your CPU will throttle — slow itself down to reduce heat — and performance drops noticeably.

GPU (graphics card) temperatures run slightly hotter than CPU temperatures. 70–85°C under load is typical; above 90°C indicates a problem. Check both because a gaming PC might have a hot GPU but a cool CPU, or vice versa.

Idle temperatures — what you see when the PC is sitting at the desktop — are less useful for diagnosis. A CPU at 35°C idle tells you nothing about whether cooling works under stress. Always check temperatures while the PC is actually doing something demanding.

Why temperature matters and when to worry

High temperatures reduce the lifespan of your CPU and GPU. They also trigger thermal throttling, where the processor slows itself to cool down, making games stutter and video exports take longer. In extreme cases, a PC will shut itself down to prevent hardware damage.

If temperatures climb above 90°C during normal use, something is wrong. The most common causes are dust buildup in the cooler or case vents, a cooler that is not mounted tightly, or thermal paste that has dried out between the CPU and cooler. These are fixable problems, but they require opening the case.

If temperatures are normal but your PC feels slow, the problem is not heat — look elsewhere. But if temperatures are high and performance is poor, cooling is the culprit.

Using stress tests to check cooling under worst-case load

Prime95 (mersenne.org) and MemTest86 (memtest.org) are free tools that push your CPU and RAM to maximum load so you can see how hot they get. Run Prime95 for 15 to 30 minutes and watch temperatures in HWiNFO at the same time. If temperatures stay below 85°C, your cooling is adequate. If they climb above 95°C, you have a problem.

For GPU stress testing, FurMark (geeks3d.com) does the same thing for your graphics card. Run it for 10 minutes and watch GPU temperature in HWiNFO. Sustained temperatures above 90°C suggest the GPU cooler needs cleaning or replacement.

Stress tests are optional — if your PC runs games and applications without overheating, you do not need to run them. But they are useful if you suspect a cooling problem or have just cleaned your cooler and want to verify the fix worked.

Checking temperatures in BIOS

Your motherboard's BIOS also displays CPU temperature. Restart your PC and press Delete, F2, or F12 during startup (the key varies by motherboard maker — watch the boot screen for the prompt). Navigate to the System Information or Hardware Monitor section. You will see CPU temperature and fan speed.

BIOS temperatures are useful as a second opinion if you distrust a software reading, but they do not update in real time and you cannot see GPU temperature there. For everyday monitoring, a program like HWiNFO is faster and more detailed.

What to do if temperatures are too high

Start with the simplest fix: shut down the PC, unplug it, and use compressed air to blow dust out of the cooler fins and case vents. Hold the can upright and use short bursts. This solves most high-temperature problems and takes 10 minutes.

If temperatures are still high, the cooler may not be making good contact with the CPU. Shut down, unplug, and remove the cooler (consult your cooler's manual for the exact steps — they vary widely). Look at the bottom of the cooler. If the thermal paste is dried out or cracked, clean it off with isopropyl alcohol and a lint-free cloth, then apply a small amount of fresh thermal paste (Arctic MX-6 or Noctua NT-H2 are common choices). Remount the cooler and test again.

If you are not comfortable opening the case, a computer repair shop can clean the cooler and replace thermal paste for $30–$60. It is worth the cost if temperatures are affecting performance.

Frequently Asked Questions

What temperature is too hot for a CPU?

Above 90°C under load is too hot and indicates a cooling problem. Above 100°C, the CPU will throttle and performance drops. Most CPUs are designed to shut down at 105–110°C to prevent damage, though you should never let it get that high.

Is 80°C safe for a GPU while gaming?

Yes. GPUs run hotter than CPUs and 75–85°C under load is normal. Above 90°C is a sign of dust buildup or a failing fan, but 80°C is not a problem.

Can I check temperature on a laptop?

Yes, HWiNFO works on laptops too. Laptop temperatures run higher because the case is smaller and airflow is restricted. 85–95°C under load is typical for gaming laptops. If your laptop is consistently above 95°C, shut it down and let it cool, then check for dust vents on the bottom and sides.

Do I need to monitor temperature all the time?

No. Check temperature once when you first set up the PC or after cleaning it, then only check again if you notice performance problems or the PC feels hot to the touch. Constant monitoring is unnecessary unless you are overclocking.

Why does HWiNFO show different temperatures for different cores?

Modern CPUs have multiple cores, and each can run at a slightly different temperature. This is normal. Watch the highest reading — if the hottest core stays below 85°C under load, cooling is fine.