My PC Was Hitting 90°C — Here's the Simple Windows Trick That Cooled It Down

⚠️ Disclaimer — Read This First: The steps below worked for me, but this advice is not professionally verified, not guaranteed to work for your setup, and carries risk. Capping your processor can affect performance, stability, and in rare cases other system behaviour. You follow this guide entirely at your own risk. If your PC is overheating severely, a hardware issue (dust, failing fans, dried-out thermal paste) may be the real culprit — and that needs attention first. When in doubt, consult a qualified technician.

The Problem: A PC / Mini PC to be exact, Running Hot Enough to Fry an Egg

My CPU was sitting at 90°C and above under normal use. I use NZXTCam to see my processor and GPU stats on the fly. The fans were screaming, the keyboard was uncomfortably warm, and I was watching the thermal throttling warnings pile up. Not great.

After checking the obvious stuff — cleaning out the vents, making sure nothing was blocking airflow — I went digging through Windows settings. Turns out there's a relatively unknown (and slightly hidden) power setting that lets you cap the maximum percentage of processor power Windows is allowed to use. On battery-hungry or thermally challenged or older machines (Keep in mind PCs get old fast in this day and age), this can make a real difference.

What You're Actually Doing

Windows 11's Power Options include a setting called Maximum Processor State. By default it sits at 100%, meaning Windows hands the CPU all the rope it wants. By dialling this down — say, to 80% or 70% — you prevent the chip from running flat out, which directly reduces heat output and power draw. The trade-off is a slight reduction in peak performance, which most people won't notice during everyday tasks.

Step-by-Step: Changing Max Processor State in Windows 11

This lives in the old Control Panel — the modern Settings app doesn't expose it.

1. Open the classic Control Panel Press Win + R, type control, and hit Enter. Yes, it still works in Windows 11.

2. Navigate to Power Options Go to: Hardware and Sound → Power Options

Or just type "power options" in the Control Panel search bar.

3. Change your plan's advanced settings Next to your active power plan, click "Change plan settings", then on the next screen click "Change advanced power settings".

A small window will pop up — this is the legacy Power Options panel.

4. Find Processor Power Management Scroll down the list until you see Processor power management. Expand it.

5. Adjust Maximum Processor State You'll see two sub-settings: On battery and Plugged in for laptops and just Min and Max for desktop/mini pc's. Both will likely read 100%.

Change them to something lower. A good starting point is:

• On battery: 60–70%

• Plugged in: 80–90%

You can always come back and tweak these.

6. Apply and close Click Apply, then OK. The change takes effect immediately — no reboot needed.

What Happened After I Did This

My CPU temps dropped noticeably during everyday use. The fans became much quieter, and that uncomfortable heat from the chassis basically disappeared. I landed on 85% as my sweet spot — I can still do most tasks without noticing any slowdown, but the system runs meaningfully cooler.

Your mileage will vary. Heavier workloads (video editing, gaming, compiling code) will feel the cap more than light tasks like browsing or document work. I am now runnign things like Docker with frigate or Home Assistant and Claude and Google Antigravity Dekstops at the same time and dont notice any issues. All this while getting normal work done int eh browser or Outlook etc...

A Few Things Worth Knowing

• This is not a substitute for proper cooling maintenance. If your fans are clogged with dust or your thermal paste is years old, fix that first. But of course those are not easy to fix and yuo need a qualified person to do that. Yes we can help you with that!

• The setting persists per power plan. If you switch plans, you may need to set it again.

• It won't fix a hardware fault. If your CPU is hitting 90°C at idle or at low load, something else is wrong.

• Performance impact is real. Don't do this on a machine where you need every last cycle.

• Some laptops ignore it. Certain OEM configurations override Windows power settings with their own firmware-level controls.

Found this useful? Share it with whoever in your life is complaining about a hot laptop or PC that is sluggish with Fans making sounds like theyt aking off. And again — your machine, your risk. Proceed with eyes open.