Baseline
56.8 °C
56.5-57.1 °C before load
Raspberry Pi 5 thermal stress test
Interactive view of 694 temperature samples and firmware throttling flags collected during a 10-minute four-core CPU stress run and the following cooldown.
Peak
85.1 °C
Repeated near the end of the stress interval
≥80 °C
5m 59s
60% of stress time
Current throttle
11s
11 one-second samples with 0xe0006
Cooldown to <80 °C
1s
After the load ended
Undervoltage
None observed
No current or historical undervoltage bits
Temperature timeline and active protection flags
Hover or tap for exact values. Drag to zoom, use the range slider to select a time window, and use the camera icon in the chart toolbar to export a PNG.
Key transitions
Times are measured from the inferred stress start at 09:18:39.
| Into test | Temperature | Status | Interpretation |
|---|---|---|---|
| 03:31 | 80.1 °C first observed | 0x0 | High-temperature alert threshold crossed |
| 03:50 | 79.0 °C | 0x80000 | Soft-temperature history bit latched |
| 04:53 | 81.2 °C | 0x80008 | Soft-temperature limit active now |
| 07:27 | 85.1 °C | 0xe0008 | Frequency-capping and throttling history appears |
| 08:10 | 84.0 °C | 0xe0006 | Current frequency cap and current throttling captured |
| 10:00 | 81.2 °C | 0xe0000 | Load stopped; current bits clear, history remains |
Primary finding
The Pi reached a firmware-controlled thermal plateau. The temperature rose from a roughly 56.8 °C baseline to 85.1 °C. Current Arm-frequency capping and current throttling were directly captured for 11s. After the load ended, current flags cleared immediately while the historical bits remained latched.
No undervoltage flags appeared, so the recorded protection behavior is thermal rather than an observed power-supply event.
Observed get_throttled bitmasks
Bits 0-3 describe current state; bits 16-19 are sticky historical flags. A checkmark means the bit is set in that hexadecimal value.
| Status | Observed time | UV now | Cap now | Throttle now | Soft-temp now | UV history | Cap history | Throttle history | Soft-temp history | Meaning |
|---|---|---|---|---|---|---|---|---|---|---|
0x0 | 3m 57s | · | · | · | · | · | · | · | · | Normal / no flags |
0x80000 | 1m 29s | · | · | · | · | · | · | · | ✓ | Soft-temperature event recorded (history) |
0x80008 | 2m 08s | · | · | · | ✓ | · | · | · | ✓ | Soft-temperature limit active now + recorded |
0xe0008 | 2m 22s | · | · | · | ✓ | · | ✓ | ✓ | ✓ | Thermal/frequency/throttle history + soft limit active |
0xe0006 | 11s | · | ✓ | ✓ | · | · | ✓ | ✓ | ✓ | Frequency capped now + currently throttled |
0xe0000 | 1m 45s | · | · | · | · | · | ✓ | ✓ | ✓ | Current flags clear; thermal history remains |