SA260324R-0263_r1

SA260324R-0263

① SA Source

• Source: 開啟完整 SA 文章
• Section: Rubin Ultra NVL576
• Line hint: 326

Context Before

To push the scale up world size beyond 144 GPUs and

Evidence

across multiple racks, optics are needed as we are approaching the maximum compute density that is within the reach of copper.

Context After

Rubin Ultra NVL576 is now on the roadmap with 8 racks of lower density Oberon.

② Atomic Claim

……跨越多個 rack 時就需要 optics，因為 compute density 已接近 copper 傳輸距離所能支援的上限。

• Epistemic Mode: ASSERTED
• Mapping Status: PARTIAL

③ Semantic Frame

{
  "attribute": "REACH_LIMIT_AT_COMPUTE_DENSITY",
  "context_nodes": [],
  "entity": {
    "id": "04_knowledge_base/Copper",
    "label": "copper"
  },
  "frame_type": "ATTRIBUTE",
  "qualifiers": {
    "condition_text": "承接前一條 world size >144 GPUs；optics 沒有 canonical entity",
    "numeric_mentions": [],
    "temporal_mentions": []
  },
  "value": {
    "numeric_mentions": [],
    "value_text": "跨多 rack、compute density 接近上限時，copper reach 不足而需要 optics。"
  }
}

④ Canonical Entity Mapping

Role	Surface Label	Canonical Target
entity	copper	Copper

⑤ Human Review

請在 Properties 逐項確認：

• 原文 → Atomic Claim 是否忠實
• Atomic Claim → Semantic Frame 是否忠實
• Canonical Entity mapping 是否正確
• Epistemic mode 是否保留原文語氣
• 最後選擇 review_action

Review state

Markdown 內文不是正式 approval。只有 Apply bridge 寫入的 Decision Ledger event 才是正式決策。