Skip to learning content

Learning Center

4.1 Cooling is room airflow

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.

Build and test

Qualify a quieter cooling layout for long renders

A design workstation runs too hot and loud during exports. Lab records use the same scene, 20-minute duration, fan curve, and 23°C ambient; baseline is CPU 88°C, GPU 82°C, 42 dBA. Choose a measured layout meeting this customer's CPU ≤82°C, GPU ≤79°C, noise ≤40 dBA targets in ≥2 repeats. Results are not additive predictions or universal limits.

CPU change from baseline—
GPU change from baseline—
Observed noise—

Change choices to compare results, then check the requirements.

  • Meet supplied CPU acceptance limit
  • Meet supplied GPU acceptance limit
  • Meet the client's noise target
  • Repeat comparable load observations at least twice
Lesson notes

Keep a clear path for cool intake air across components and warm exhaust air out.

Airflow is a path

Fans work best when they create a clear path through the case. Dust filters, cable clutter, blocked intakes, and poor cooler mounting can all hurt results.

  • Intake brings cooler air in.
  • Exhaust moves warmer air out.
  • Dust and blocked paths raise temperatures.

Quiet is not the same as cool

A quiet system can still be too hot if fans are too slow under load. Test temperatures during real work, not only at idle.

Worked example

Inputs: Same simulated workload/room temperature: baseline CPU 88°C/GPU 82°C; after intake cleaning/routing CPU 80°C/GPU 77°C.

Task: Report changes and a controlled comparison.

Check the reasoning

CPU −8°C; GPU −5°C. Record workload, duration, ambient, fan curve, noise, and limit flags.

Cleaning/routing require power isolation. Compare exact manufacturer limits, not universal thresholds.

Cool air inComponentsWarm air out
Keep intake and exhaust clear so air crosses heat sources. Follow the case and component instructions.