CPU/GPU/ANE Power Readings Doubled at ≥2s Update Interval

[andytran93]

Issue:
When sensor update interval is set to 2 seconds or higher, reported CPU, GPU, and ANE power values are ~2x higher than actual (validated against powermetrics, asitop and physical USBC power meter). Total system power reading remains accurate.

Steps to reproduce:

1. Set update interval ≥2s.
2. Observe CPU/GPU/ANE power readings during heavy load (e.g., ANE reads ~12W vs. actual max ~6W. CPU reads ~100W vs actual ~50W)
3. Compare with powermetrics — readings match only when update interval in Stats is set to 1s.

I suspected this might be caused by the concurrent powermetrics process I used for validation, however the issue also persists in isolation.

Impact:
False/misleading power analysis for components.

Expected:
Accurate component power readings regardless of update interval.

Happy to help with testing etc

Setup

• M4 Max MacBook Pro
• MacOS Tahoe 26.1 Beta (25B5072a)

[andytran93]

Screen recording of bug attached, showing discrepancy between Stats and asitop when Stats set to 2 second update interval:

Stats.Bug.mp4