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3.1 Why fast CPUs still need support

Lesson
Hardware safety: isolate power; never open a PSU.

Before touching hardware

  • Follow the exact model's service instructions. Shut down, unplug mains and peripherals, and disconnect any internal battery as instructed. Sleep, the PSU switch, or unplugging a laptop charger alone does not fully isolate power.
  • Let parts cool. Use a clean, dry workspace and approved ESD precautions. Hold boards by their edges, avoid contacts, account for screws, and never force connectors.
  • Never open a PSU or insert tools through its vents; stored energy can remain after unplugging. Use only modular cables confirmed compatible with the exact PSU model.
  • Isolate power before every physical change or cleaning. Powered tests are software/external observations with hands and tools out. No live probing, unspecified pin bridging, or damaged-battery servicing.
  • Stop for damage, swelling, liquid, burning smells, or unclear instructions; consult qualified service. Photos, diagrams, and supplied readings are sufficient for these exercises.

Service and ESD guidance · Example PSU cable chart. Check your exact model.

Practice lab

0 / 1solved

Saved on this device. Practice is ungraded.

Investigate

Investigate a slow video export

A video editor reports that exports start quickly, then slow down. The CPU log shows minute 1 at 4.5 GHz / 65°C and minute 10 at 3.2 GHz / 95°C with the thermal-limit flag active. Use the readings and an isolated inspection photo to test one cause before recommending replacement parts. These temperatures are not universal limits.

Decision 1

Performance decays over time

Choose the leading hypothesis from the log.

Lesson notes

CPU boost depends on available power and cooling. Thermal limits reduce speed to protect the processor.

Boost is temporary extra speed

Boost speed is not a promise that every core will run at that speed forever. It depends on temperature, power limits, motherboard settings, and the cooler.

  • Good cooling helps performance stay steady.
  • A weak cooler can make a strong CPU act weaker.
  • Motherboard firmware can change power behavior.

The safe technician habit

When performance drops after a few minutes, check temperatures before buying a new CPU. The problem may be heat, dust, cooler mounting, or airflow.

Worked example

Inputs: Simulated CPU test: initially 4.5 GHz / 65°C; after 10 min 3.2 GHz / 95°C; thermal-limit flag is active.

Task: Give one supported hypothesis, a safe observation, and a follow-up validation.

Check the reasoning

Thermal limiting is supported by the flag. Record ambient and cooler/fan data using software. After safe inspection and any isolated change, repeat the same test.

Example readings are not universal temperature limits. Compare the exact CPU manufacturer limits; power or workload changes also affect clocks.