The case changes the question
A bare board on a desk has convenient access to room air. A finished enclosure introduces panels, cable bundles and neighbouring components that can change the path of that air. Start a cooling review with the intended assembly, including its orientation and normal peripherals. Describe the operating environment in the project notes. The question is whether that system maintains the required behaviour, not whether the processor can finish a short task before the assembly has warmed through.
Observe the control system
Raspberry Pi documents temperature-driven fan control and the role of cooling in reducing throttling. On Jetson, NVIDIA documents temperature and frequency observation through its platform tools. These signals help explain a run, but no single temperature reading establishes the whole thermal story. Log the application’s response alongside temperatures and clocks. If the output slows, the timing of those changes can guide the next investigation rather than making every slow interval look like a cooling fault.
Include the load pattern
Choose a sustained task that resembles deployment, plus an idle interval and a return to work. A camera system may have an almost continuous workload; an interactive assistant may have bursts separated by pauses. The cooler has to suit that pattern and any noise or power constraints. Keep input settings fixed while changing the physical assembly. Altering the model, fan policy and case together makes it difficult to learn which change affected the system’s behaviour.
Write an acceptance condition
Define success in terms of the application’s required response, permitted environment and stable operating state. Record the assembly, fan policy and observations needed to reproduce that assessment. If the design misses the requirement, consider airflow, a different workload limit or a lower power configuration before treating a larger fan as the only remedy. A cooling decision becomes reviewable when its conditions and tradeoffs are explicit; the presence of a heatsink alone supplies neither.
Sources & publication notes
- Raspberry Pi: computer hardware, power and thermal documentation ↗
- NVIDIA Jetson Linux r36.4.3: platform power and performance ↗
Retrospective period: June 2025. Written and published November 2, 2026. Product announcements establish release timing; support pages are linked as current references.