VR2R-0406_r1

VR2R-0406

① SA Source

• Source: 開啟完整 SA 文章
• Section: Compute Tray: Power Delivery
• Line hint: 338

Context Before

50VDC enters the Strata Board via one of the 50V power connectors on both sides of the Strata board. 50VDC is stepped down to 12VDC by the IBC module at the bottom of the Strata Board. Then the 12VDC will be stepped down to 1VDC by the VRM before feeding into the Rubin GPU and Vera CPU. Strata directly receives 50VDC whereas the Bianca board of Grace Blackwell receives 12VDC from the PDB.

Evidence

As the Strata board draws around 4800W of power (equivalent to the TDP of half a general server rack) versus Bianca at 3000W, it is necessary to deliver power to the board at a higher voltage.

Context After

The benefit of moving 50VDC-12VDC conversion closer is to the reduce current and increase transmission efficiency. 96 Amps at 50V has 17x lower power loss than 400A at 12V due to the quadratic relationship between power loss and current.

② Atomic Claim

Strata board 約消耗 4,800W，約等同半個一般 server rack 的 TDP；相比 Bianca 約 3,000W，因此必須以更高 voltage 向 Strata 供電。

• Epistemic Mode: ASSERTED
• Mapping Status: COMPLETE

③ Semantic Frame

{
  "comparison_expression": "Strata draws about 4800W versus Bianca at 3000W, motivating higher-voltage board power delivery.",
  "entities": [
    {
      "id": "04_knowledge_base/NVIDIA Strata Board",
      "label": "Strata board"
    },
    {
      "id": "04_knowledge_base/Bianca Board",
      "label": "Bianca"
    }
  ],
  "frame_type": "COMPARISON",
  "metric": "POWER_DRAW",
  "operator": "GREATER_THAN",
  "qualifiers": {
    "condition_text": null,
    "numeric_mentions": [
      "4800W",
      "3000W",
      "half"
    ],
    "temporal_mentions": []
  }
}

④ Canonical Entity Mapping

Role	Surface Label	Canonical Target
entity	Strata board	04_knowledge_base/NVIDIA Strata Board
entity	Bianca	04_knowledge_base/Bianca Board

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。