VR2R-0356_r1

VR2R-0356

① SA Source

• Source: 開啟完整 SA 文章
• Section: PCB Materials Upgrade and Area Growth
• Line hint: 306

Context Before

Quartz cloth is the next generation material that replaces the glass fiber cloth materials as the reinforcing layer, pushing dielectric constant even lower. Besides lower dielectric constant, quartz cloth also has the benefits of being stronger, more temperature resistance, and having a lower CTE. On the other hand, the cost is multiples higher than that of the highest-grade glass fiber cloth and is much harder to process at the PCB manufacturing level, leading to worse yield.

Evidence

Within VR NVL72, Quartz is initially adopted for the Orchid board

Context After

and the midplane to allow the longest distance PCIe Gen 6 signal traveling through these two boards with as little insertion loss as possible. However, given the cost of the Quartz cloth and the difficulty in Q cloth processing, Nvidia is currently exploring the option of downgrading back to glass fiber cloth. The final decision is pending on the signal performance with the downgraded glass fiber cloth.

② Atomic Claim

在 VR NVL72 中，Quartz 最初用於 Orchid board……

• Epistemic Mode: ASSERTED
• Mapping Status: PARTIAL

③ Semantic Frame

{
  "frame_type": "NARY_RELATION",
  "participants": [
    {
      "node": {
        "id": "04_knowledge_base/VR NVL72",
        "label": "VR NVL72"
      },
      "role": "system"
    },
    {
      "node": {
        "id": "04_knowledge_base/NVIDIA Orchid Board",
        "label": "Orchid board"
      },
      "role": "board"
    }
  ],
  "qualifiers": {
    "condition_text": "Quartz is plain text in source claim; sentence continues in VR2R-0357",
    "numeric_mentions": [],
    "temporal_mentions": [
      "initially"
    ]
  },
  "relation_type": "INITIAL_QUARTZ_ADOPTION_IN_VR"
}

④ Canonical Entity Mapping

Role	Surface Label	Canonical Target
system	VR NVL72	04_knowledge_base/VR NVL72
board	Orchid board	04_knowledge_base/NVIDIA Orchid 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。