VR2R-0138_r1

VR2R-0138

① SA Source

• Source: 開啟完整 SA 文章
• Section: BlueField-4
• Line hint: 113

Context Before

BlueField-4’s design departs significantly from BlueField-3. Instead of doing a bespoke tapeout with compute and networking, NVIDIA simply reuses their large Grace CPU die, co-packaged with a ConnectX-9 die to make an 800G DPU with massive compute capabilities.

Evidence

128GB of LPDDR5 feeds the Grace CPU at half the bandwidth of regular Grace.

Context After

That is 4x the memory capacity of BlueField-3. BlueField-4 can also function as a storage controller, with four BF-4 chips in each Context Memory Storage system.

② Atomic Claim

128GB LPDDR5 供給 Grace CPU，其 bandwidth 為一般 Grace 的一半。

• Epistemic Mode: ASSERTED
• Mapping Status: COMPLETE

③ Semantic Frame

{
  "comparison_expression": "128GB LPDDR5 feeds the Grace CPU at half the bandwidth of regular Grace.",
  "entities": [
    {
      "id": "04_knowledge_base/LPDDR5",
      "label": "LPDDR5"
    },
    {
      "id": "04_knowledge_base/NVIDIA Grace",
      "label": "Grace CPU"
    }
  ],
  "frame_type": "COMPARISON",
  "metric": "MEMORY_BANDWIDTH",
  "operator": "HALF_OF_REFERENCE",
  "qualifiers": {
    "condition_text": null,
    "numeric_mentions": [
      "128GB",
      "half"
    ],
    "temporal_mentions": []
  }
}

④ Canonical Entity Mapping

Role	Surface Label	Canonical Target
entity	LPDDR5	LPDDR5
entity	Grace CPU	04_knowledge_base/NVIDIA Grace

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。