Documenting an undocumented chip: the TensorCore of TPU v5e
Comments on “Documenting an undocumented chip: the TensorCore of TPU v5e”
3 judges. Scored by all three judges. Only the day’s top stories get the claim check. How far stories are checked
An unofficial, experimentally derived reference for the TensorCore of Google's TPU v5e, documenting its instruction set and per-instruction cycle counts. The author built a custom minimal driver and ran micro-kernel probes on a physical chip, with LLM agents assisting in exploring the design.
Why it ranked
No. 40 of 107 with a score of 0.58. The panel rated it highest on technical depth (0.98) and new information (0.94), lowest on audience breadth (0.36). The judges disagreed most on significance (spread 0.48), so the story is marked contested. Placed No. 40, No. 70 by score alone: the fourth Hardware & devices story of the day (−0.020). The placement terms move stories; they are not part of the score.
- AI judgeJudge 2claude-haiku-5-5
- Detailed, experimentally derived unofficial reference for TPU v5e TensorCore; highly technical with specifics, but niche audience and a single-chip scope limit breadth and practical impact.
- AI judgeJudge 3gpt-5.6-luna
- Experimental reverse engineering of TPU v5e TensorCore instructions, timings, memory behavior, and microarchitecture offers unusually deep, reproducible technical detail. It is highly relevant to ML systems builders, though specialized and truncated.
Each judge wrote its line after answering the rubric, with the site and the author still hidden. Every answer behind this is in the table under Score.
Score
0.58total under rubric v2.3Contestedjudges differ by 0.48 on significance
- Significance0.53
- Reader interest0.68
- Audience breadth0.36
- Practical relevance0.49
- Substantiated0.84
- Technical depth0.98
- New information0.94
- Counts against: Promotional0.02
- Counts against: Overclaim0.10
Each judge’s answer per question (0–1), their mean and spread, and what the question adds to the score (weight × mean).
| Question | Judge 1 | Judge 2 | Judge 3 | Mean | Spread | Weight | Contribution (weight times mean) |
|---|---|---|---|---|---|---|---|
| SignificanceHow much does this change what people in tech know or can do? | 0.51 | 0.30 | 0.78 | 0.53 | 0.48 , above the contested threshold | +0.24 | +0.127 |
| Reader interestWould a well-informed senior engineer or tech founder want to read this today, and likely pass it on? | 0.55 | 0.60 | 0.88 | 0.68 | 0.33 | +0.26 | +0.176 |
| Audience breadthHow many people who build technology does it concern? | 0.41 | 0.25 | 0.42 | 0.36 | 0.17 | +0.13 | +0.047 |
| Practical relevanceHow useful is it to someone who builds software or tech products? | 0.41 | 0.35 | 0.72 | 0.49 | 0.37 | +0.22 | +0.109 |
| SubstantiatedHow well is it backed? Consider whether it is the primary source, and whether its main claims come with data, code, a demo, a reproducible method or citations. | 0.81 | 0.80 | 0.92 | 0.84 | 0.12 | +0.05 | +0.042 |
| Technical depthHow technically substantive is it? | 1.00 | 0.95 | 1.00 | 0.98 | 0.05 | +0.05 | +0.049 |
| New informationDoes it contain information absent from the stories covered in the last 7 days (list provided)? | 0.89 | 0.95 | 0.98 | 0.94 | 0.09 | +0.05 | +0.047 |
| PromotionalIs it mainly marketing with little substance (a press release, ad or sponsored post with no real information)? A launch post that carries real news is not promotional. | 0.03 | 0.02 | 0.01 | 0.02 | 0.02 | −0.19 | −0.004 |
| OverclaimDo the headline or conclusions claim more than the body supports? | 0.17 | 0.10 | 0.04 | 0.10 | 0.13 | −0.11 | −0.011 |
| Sum of contributions | +0.582 | ||||||
| Claim-check penalty | 0.000 | ||||||
| Total, as published | 0.582 | ||||||
Spread is the highest minus the lowest judge answer. marks a spread above 0.40: the judges disagree, and the story is marked contested.
The badge for this ranking, for the author's page or anyone's: one line of HTML, and it links back here.
<a href="https://rubric.hrih.si/editions/2026-11-03/40/"><img src="https://rubric.hrih.si/badge/2026-11-03/40.svg" alt="Ranked #40 on Rubric, 3 Nov 2026" width="238" height="28"></a>Also covered by
No other coverage was clustered with this story.
Elsewhere
Elsewhere: HN 5 pts, not on front page
Recorded for context only, checked 3 Nov 2026, 05:47 UTC. It played no part in the ranking.