Processor · critical

How to fix CLOCK_WATCHDOG_TIMEOUT (0x101)

Processor troubleshooting guide

What this error means

Windows stopped because one of the processor's cores did not respond to a regular clock signal in time. Microsoft explains that the core is usually unresponsive or deadlocked. Because the problem is in the processor itself, the usual causes are an unstable CPU overclock or undervolt, outdated BIOS or processor microcode, overheating, power delivery problems or, less often, a faulty processor. Drivers are a less common cause than with most stop codes.

Updated

Applies to
Windows 11 and Windows 10, Intel and AMD desktops and laptops
Difficulty
Beginner to intermediate
Before changes
Low; BIOS updates need care

Reviewed by Matyáš Rada · Documentation checked: 2026-10-31 · Checked against Microsoft's bug check and stop code troubleshooting documentation; not tested on every processor.

Before you begin

Note whether the crash happens under load (gaming, rendering) or at idle, and write down your processor and motherboard model (Win + R, msinfo32). If Windows cannot start, see the startup guide.

Work through these checks

0 of 7 complete
01Load default BIOS settings and remove CPU tuning

An unresponsive processor core is most often caused by settings that push the CPU beyond what is stable.

  1. Enter the BIOS (often Del or F2 at startup) and choose Load optimized defaults.
  2. Make sure CPU overclocking, undervolting (for example Curve Optimizer or offset voltage) and automatic boost tuning such as PBO are off, and turn off XMP/EXPO for testing.
  3. Uninstall tuning tools that apply CPU settings at Windows startup.
What to expect

The crashes stop at default settings.

If it does not help

If they stop, re-enable settings one at a time and keep the last stable configuration.

Browse related errors
02Update the BIOS

BIOS updates include processor microcode and stability fixes that directly affect how the cores behave.

  1. Find your exact motherboard or PC model on the maker's support page.
  2. Read the BIOS release notes for processor stability or microcode updates, and install the latest version.
  3. After the update, load defaults again.

Do not switch off the PC during a BIOS update.

What to expect

The PC runs stably on the new BIOS.

If it does not help

Laptops and prebuilt PCs get BIOS updates from the PC maker, often through its support app.

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03Check CPU temperatures and cooling

An overheating processor throttles and can become unstable.

  1. Watch the CPU temperature under load with a monitoring tool and compare it with the maker's maximum.
  2. Clean dust from the cooler and case fans, and check that the CPU fan spins.
  3. If temperatures jump very quickly, the cooler may be poorly mounted or need new thermal paste.

Switch off and unplug the PC before working inside it.

What to expect

Temperatures stay below the processor's limit under load.

If it does not help

On laptops, keep the vents free and use the PC on a hard surface.

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04Update the chipset driver and Windows

The chipset driver and Windows updates control processor power states and scheduling.

  1. Install the latest chipset driver from AMD, Intel or your PC maker.
  2. Run Windows Update, including optional driver updates.
  3. Set the power plan back to Balanced if you changed it with a tuning tool.
What to expect

Drivers and Windows are current.

If it does not help

Use the PC normally for a few days and watch for new crashes.

Browse related errors
05Test the memory

Unstable memory can make a core stall while waiting for data.

  1. Run Windows Memory Diagnostic (Win + R, mdsched.exe) > Restart now and check for problems.
  2. Check the MemoryDiagnostics-Results entry in Event Viewer > Windows Logs > System.
What to expect

No memory errors are found.

If it does not help

If errors are found, follow the memory test errors guide on this site.

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06Check the power supply

Unstable voltage under load can make a processor core stop responding.

  1. Check that the CPU power connectors (4+4 or 8-pin near the processor) are fully inserted.
  2. Make sure the power supply is sufficient for your components.
  3. If crashes happen mainly under heavy load, test with a known-good power supply if possible.

Never open a power supply.

What to expect

The PC stays stable under load.

If it does not help

If it does, the original power supply may be failing.

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07Contact the PC or CPU maker if it continues

When the crash continues at default settings with current firmware and good cooling, the processor or motherboard may be faulty.

  1. Run the PC maker's hardware diagnostics, if available.
  2. Collect the crash dumps from C:\Windows\Minidump and note when the crashes happen.
  3. Contact the PC maker, or the CPU maker's warranty support for boxed processors.
What to expect

You get a repair or replacement for a faulty part.

If it does not help

Keep the BIOS at defaults until the issue is resolved.

Browse related errors

Possible causes

  • CPU overclock, undervolt or automatic boost tuning that is not stable
  • Outdated BIOS/UEFI or processor microcode
  • CPU overheating or a poorly mounted cooler
  • Unstable power delivery from the power supply or motherboard
  • A faulty processor or motherboard

Useful Windows tools

These commands open Windows tools. Review changes before applying them.

eventvwr.msc
mdsched.exe
msinfo32

Sources & further reading