Maximizing Raspberry Pi performance with active cooling

Why cooling matters

The Raspberry Pi 5 is the most powerful Raspberry Pi ever released, with roughly 2–3× the CPU performance of the Pi 4. That power comes with increased heat generation, especially under sustained workloads.

For lightweight tasks—web browsing, running simple scripts, or casual desktop use—heat isn't a concern. But for demanding applications, the processor heats up quickly and thermal throttling kicks in to protect the hardware.

Thermal throttling is when the CPU automatically reduces its clock speed to lower temperatures. While this prevents damage, it also reduces performance right when you need it most.

Understanding thermal throttling

When your Raspberry Pi 5 reaches a critical temperature (typically around 80–85°C), the system reduces the processor speed to cool down. This happens automatically and transparently—you may just notice your Pi slowing down during intense tasks.

When does throttling happen?

Thermal throttling is most likely to occur during:

• Compiling software: Building code from source pushes all CPU cores to 100%
• Retro gaming and emulation: Sustained CPU and GPU load from emulators
• Home servers: Continuous background processes, database queries, or web serving
• AI and machine learning: Inference workloads that max out the CPU
• Video encoding: Transcoding or processing video files

Without cooling, a Pi 5 under sustained load will reach throttling temperatures in under a minute. With active cooling, it stays well below that threshold and maintains full performance indefinitely.

The Raspberry Pi 5 Active Cooler

To address thermal management, Raspberry Pi released the Raspberry Pi 5 Active Cooler—an official accessory designed specifically for the Pi 5. Priced under $20, it's an affordable solution that makes a significant difference.

What's included

The Active Cooler combines two key components:

• Large aluminum heatsink: A finned metal heat spreader that draws heat away from the processor
• Temperature-controlled fan: A variable-speed PWM fan that automatically adjusts based on CPU temperature

The cooler attaches directly to the Pi 5 using the dedicated mounting holes and thermal pads (pre-attached). It connects to the board's fan header, allowing software control of fan speed.

How it works

Heat from the CPU spreads across the heatsink's fins. The fan pushes cool air over the fins, carrying heat away from the board. The fan stays off when temperatures are low, so it's silent during idle or light use. When the CPU heats up, the fan automatically spins faster to maintain safe temperatures.

Vilros also offers cooling solutions for the Pi 4 and Pi 5, including cases with integrated active cooling.

Performance impact

The difference between active cooling and no cooling is dramatic under sustained workloads.

According to testing from Raspberry Pi, a Pi 5 without cooling quickly reaches thermal throttling under computational loads, reducing performance to around 60–70% of maximum. With an active cooler, the Pi 5 stays below throttling temperatures and maintains 100% performance indefinitely.

Even if you don't plan to push your Pi to its limits, active cooling is advisable. It extends the lifespan of your hardware by preventing heat damage and keeps the system responsive during occasional bursts of heavy activity.

Choosing your cooling solution

For most users, the official Raspberry Pi 5 Active Cooler is the best choice. It's designed specifically for the Pi 5, installs easily, and works out of the box with Raspberry Pi OS fan control.

If you're building a case-based setup, consider a case with integrated cooling. Vilros offers cases for both the Pi 4 and Pi 5 that include active cooling, combining protection and thermal management in one solution.

For compact builds or Pi Zero projects, passive cooling (heatsinks alone) may be sufficient since those boards generate less heat. But for the Pi 5, active cooling is highly recommended for any sustained workload.