Your PC is overheating, and Windows won't tell you - here's how to check

When your PC slows to a crawl during a heavy task, the fans start howling, but Task Manager might not show anything unusual. In such scenarios, the catch is almost always heat. However, Windows 11 won't tell you that. It just displays GPU temperatures in the Performance tab, but remains completely blind to CPU thermals. Furthermore, it still lacks the ability to flag thermal throttling as it happens, leaving you to guess why your performance is dipping.

HWiNFO is the free tool every PC owner should install

If I could only keep one monitoring tool on my PC, it would be HWiNFO. It's free, it reads practically every sensor on your motherboard, CPU, and GPU, and it's the same tool reviewers and overclockers have trusted for years.

After downloading HWiNFO, run the installer, but when you launch it, check "Sensors-only" before hitting Start, since the full system summary is overkill for temperature checks. The sensors window looks intimidating at first, but you only need a handful of rows, including CPU Package, per-core temperatures, GPU Temperature, and GPU Hotspot (or Junction) for the graphics card.

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Scroll to those rows, right-click any value, and choose "Add to tray" so the reading sits in your taskbar while you game or work. That alone is worth the install since you get a live temperature readout without keeping a window open.

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One more thing I'd recommend is to use the logging feature (at the bottom-right) during a long gaming session or render. HWiNFO will dump everything to a CSV file, which makes it easier to catch a brief spike you'd otherwise miss while staring at a moving number.

Core Temp is the lighter option if HWiNFO feels like overkill

HWiNFO throws a wall of sensors at you, and I get why that's a turn-off if all you want is a quick temperature check. In that case, you can use Core Temp. It's free, tiny, and it shows your CPU temperatures and not much else. If you don't care about fan RPMs, voltages, or GPU hotspot readings, this is the faster pick.

You need to pay attention during setup - the installer tries to slip in a bundled app, so uncheck that box before you click through. Once it's running, you'll see per-core temperatures, load percentages, and the Tj. Max value, which is the temperature ceiling where your CPU starts throttling to protect itself from overheating.

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That Tj. Max number is the one I'd keep an eye on. If your cores are sitting 10-15°C below it under load, you're fine. If they're reaching it, you've got a cooling problem worth investigating. The catch is that Core Temp is CPU-only. There's no GPU data here, so if your graphics card is the suspect, you'll still need HWiNFO or your GPU vendor's software to get the full picture.

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Know what's normal before you start panicking

Modern CPUs and GPUs run hot by design. They boost clocks until they hit a thermal limit, then back off; that's the intended behavior. For most current desktop CPUs, idle temperatures range from 35°C to 50°C, depending on your cooler and room temperature. Under heavy workloads, 70-85°C is standard. It's important to note that many modern high-end processors are designed to aggressively boost clocks until they reach a 95°C thermal target. In these cases, hitting that ceiling is often the intended behavior to maximize performance, rather than a sign of immediate failure.

GPUs follow a similar pattern. Edge temperatures of 60-85°C under gaming load are expected. However, GPU hotspot (or junction) sensors often run 15-25°C hotter than the edge temperature. This gap is normal, and while modern cards can handle brief spikes, sustained temperatures above 90°C are where you should start looking into better cooling solutions.

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HWiNFO tells you exactly when throttling is happening. In the sensors window, look for rows labeled "Thermal Throttling," "PROCHOT," or "Core Thermal Throttling." They sit at "No" until your CPU starts pulling back clocks to cool itself, then flip to "Yes."

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The honest test is to run a short stress test or a demanding task while watching those rows alongside your core clocks and package temperature. If clocks drop while temps are pegged near the ceiling, it's due to throttling. GPUs report similar performance cap reasons, so you can catch a thermal-limited graphics card the same way.

These three free fixes bring temperatures back down

If the numbers indicate a heat problem, three things reduce temperatures on most overheating PCs, and all of them are free.

You can start with dust. A case that hasn't been opened in a year is almost always carrying enough buildup on the CPU cooler fins, GPU heatsink, and intake filters to choke airflow. Take it outside, grab a can of compressed air, and blow it out. Remember to hold the fans still while you do so, since spinning them with air pressure can generate electricity that can damage the motherboard or GPU.

Next, look at airflow. Cables stuffed across the intake or a case shoved against a wall will trap heat, no matter how good your cooler is. Give the case room to breathe, route cables out of the fan paths, and make sure your intakes and exhausts aren't working against each other.

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The last fix is fan curves. Most stock curves from motherboard vendors are tuned to keep things quiet, which means your fans only ramp up after temperatures are already high. You can adjust this in the BIOS or use a free tool like FanControl to make the curve more aggressive - an earlier ramp-up and higher speeds under load. It's louder, sure, but it works, and you didn't have to buy anything.

The fix starts with knowing the number

Heat is the one variable Windows leaves you to figure out on your own, and that's the whole problem - you can't fix what you can't see. Install HWiNFO or Core Temp, monitor your temperatures under a real workload, and you'll know within minutes whether thermals are the bottleneck or you've been chasing the wrong suspect entirely.