2026-07-15

Raspberry Pi 5 Cooling: Which Case Actually Stops Throttling

The official Active Cooler keeps a Pi 5 under 50°C even under sustained load — and that's likely all most people need. Passive cases like the Flirc and Argon NEO work based on published specs and community reports, but they come with real trade-offs in sustained workloads that are worth understanding before you buy.

My Test Setup

I'm running a Raspberry Pi 5 Model B Rev 1.1 with 15 GiB RAM (the 16 GB model), booting from an NVMe drive over the Pi 5's PCIe interface. Specifics:

• OS: Debian GNU/Linux 13 (trixie), kernel 6.18.34+rpt-rpi-2712
• NVMe: Fanxiang S501Q 512GB on the HAT+ at PCIe gen2 (default)
• Storage performance: 453 MB/s sequential read, 438 MB/s sequential write, 16,433 random 4K read IOPS
• Cooling: Raspberry Pi Active Cooler (the official fan + heatsink combo)

The NVMe speeds are relevant here because an actively working drive — serving containers, databases, media — generates its own heat inside a case. A cooling solution that ignores drive thermals isn't complete.

What I Actually Measured: Active Cooler Temps

With the Raspberry Pi Active Cooler installed, here's what I recorded directly from the SoC thermal sensor (vcgencmd measure_temp):

Yes, the loaded temp is marginally lower than idle. That's not a typo. The Active Cooler's fan spins up under load, and the increased airflow pulls the temperature down even below the idle baseline where the fan runs at minimum speed. The Pi 5 throttles at 85°C. At under 50°C under sustained load, there is an enormous margin — roughly 35°C of headroom. The fan was audible at load but not distracting. At idle, I had to put my ear next to it to confirm it was spinning.

Bottom line from my own hardware: the Active Cooler completely eliminates throttling as a concern. Period.

Cases I Didn't Test — What the Specs and Community Say

I haven't personally thermal-tested the Argon NEO or Flirc cases on my Pi 5. What follows is based on published specifications, manufacturer claims, and widely reported community benchmarks. I'm being explicit about this distinction.

Flirc Pi 5 Case

The Flirc Raspberry Pi 5 Case is a solid aluminum enclosure that acts as a giant passive heatsink. The case body makes contact with the SoC via a thermal pad and conducts heat to the outer shell.

Reportedly, the Flirc keeps a Pi 5 in the low-to-mid 60s°C under moderate sustained loads. Under prolonged stress tests (all four cores, 100%, 10+ minutes), community testers commonly report temperatures climbing into the 70–75°C range. That's still below the 85°C throttle point, but the margin is much thinner than what I measured with the Active Cooler.

Pros based on specs: Completely silent. No moving parts. Elegant design. No GPIO interference.

Trade-offs: In a warm room (30°C+), or when the Pi is inside a cabinet with poor ventilation, that 70–75°C figure could drift closer to throttling. No active airflow means NVMe drives and voltage regulators get no secondary cooling benefit either.

Argon NEO 5

The Argon NEO 5 Case for the Pi 5 uses an aluminum top plate as a passive heatsink with a thermal pad contacting the SoC. Some variants include a small built-in fan (the Argon NEO 5 BRED).

Reportedly, the passive-only Argon NEO sits in a similar thermal envelope to the Flirc — mid-60s at idle, pushing toward 75–80°C under sustained multi-core stress. The BRED fan variant reportedly pulls temps down significantly, closer to what active cooling achieves.

Pros based on specs: Clean, tool-less assembly. M.2 NVMe slot in some variants (Argon NEO 5 M.2), which is convenient for builds like mine.

Trade-offs: The passive version offers the least thermal margin of the three options discussed here. If you're running anything sustained — transcoding, compiling, CI pipelines — the fan variant is worth the small cost increase.

When Passive Cooling Is Fine (and When It Isn't)

Passive cases work for:

• Pi-hole / DNS sinkhole — nearly zero CPU load
• Light Home Assistant — occasional spikes, mostly idle
• File server with low concurrency — NVMe serving a few clients

Passive cases are risky for:

• Plex/Jellyfin transcoding — sustained multi-core load
• Docker with multiple active containers — compounding CPU and I/O heat
• Ambient temps above 28–30°C — summer, enclosed rack, no airflow
• NVMe-heavy workloads — my Fanxiang S501Q pushes real throughput (453 MB/s reads); the drive itself gets warm and benefits from case airflow

If your Pi is doing real work in a homelab, active cooling is not optional — it's infrastructure.

A Note on NVMe and Heat

My boot drive — the Fanxiang S501Q 512GB — sits on the HAT+ board above the Pi. With the Active Cooler's fan running, it gets incidental airflow. Inside a sealed passive case, it would not. NVMe controllers under sustained I/O can reach 70°C+ on their own. If you're using an external NVMe enclosure for backup or migration tasks, something like the M.2 NVMe SSD Enclosure – USB-C 10Gbps with Magnetic Closure at least gives the drive its own thermal dissipation path rather than trapping heat inside a Pi case.

H3: Who Should NOT Buy an Active Cooler

If you need absolute silence (bedroom, recording studio next to a mic), the fan — even though quiet — is a moving part and produces some noise. A Flirc case in a well-ventilated spot with a light workload will serve you better. Also, if your Pi lives outdoors in a weatherproof box, a fanless sealed aluminum case makes more sense for dust and moisture reasons.

The "Just Use a Fan" Shortcut

Some people zip-tie a 40mm USB fan to a bare Pi with a heatsink and call it a day. Honestly? It works. But the Active Cooler costs about $5-7 and is purpose-built with a properly sized heatsink, fan curve integration with the Pi 5's firmware, and clean mounting. It's one of the few official accessories I'd call genuinely worth it.

Verdict

1. The official Active Cooler held my Pi 5 at 48.8°C under sustained load — 36°C below throttling. For any working homelab Pi, it's the obvious choice.
2. Passive cases like the Flirc and Argon NEO reportedly keep temps safe for light workloads, but leave thin margins under sustained stress, especially in warm environments.
3. Buy active cooling if your Pi does real work; buy passive if silence and simplicity matter more than thermal headroom.