"How I discovered a hidden 146W power draw on NVIDIA A100 GPUs (and built an open‑source fix)”

May 20, 2026 · 2:17 AM UTC ·2 min read · 0 reactions · 0 comments · 35 views

#gpu #ai #opensource #observability #energyefficiency

TL;DR · WeSearch summary

An independent researcher discovered a hidden power draw of 146W on NVIDIA A100 GPUs, despite the telemetry reporting 0% utilization. This anomaly, termed 'ghost power', can lead to significant energy waste and incorrect scaling decisions in cloud environments. To address this issue, the researcher developed an open-source tool that detects these anomalies and benchmarks energy efficiency across various cloud providers.

Key facts

▪The NVIDIA A100 GPU can draw 146W while reporting 0% utilization, leading to wasted energy.
▪The researcher conducted 35 hardware tests to validate the existence of ghost power specific to A100 GPUs.
▪An open-source tool was created to detect these anomalies and provide energy efficiency benchmarking.

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Original publisher	DEV.to (Top)
Canonical URL	https://dev.to/mikebains41debug/how-i-discovered-a-hidden-146w-power-draw-on-nvidia-a100-gpus-and-built-an-open-source-fix-1n8h
Publication time	Wed, 20 May 2026 02:17:23 +0000
Retrieval time	2026-05-20T02:34:58.982Z
Last seen	2026-05-20T02:34:58.982Z
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try { if(localStorage) { let currentUser = localStorage.getItem('current_user'); if (currentUser) { currentUser = JSON.parse(currentUser); if (currentUser.id === 3935300) { document.getElementById('article-show-container').classList.add('current-user-is-article-author'); } } } } catch (e) { console.error(e); } mikebains41-debug Posted on May 20 "How I discovered a hidden 146W power draw on NVIDIA A100 GPUs (and built an open‑source fix)” #monitoring #opensource #performance #showdev How I discovered a hidden 146W power draw on NVIDIA A100 GPUs (and built an open‑source fix) TL;DR: nvidia-smi reported 0% utilization, but the GPU was drawing 146W. Standard telemetry lies. I built an open‑source detector and a new efficiency benchmark (CEI).

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