clm_162594bd89d1437c96d9eb746a79d7ea_r1

VR2-0309

① SA Source

• Source: 開啟完整 SA 文章
• Section: Relocating ConnectX-9
• Line hint: 411

Context Before

Source: Nvidia VR NVL72 Component BoM and Power Budget Model ↗

Evidence

For the GB200/GB300, the PCIe signal distance between the GPU/CPU and the CX-7/8 is shorter than the Ethernet/InfiniBand signal distance between the CX-7/8 and the OSFP cages

Context After

But now that the NIC is closer to the OSFP cage, the lower speed PCIe Gen6 signal (64Gbit/s per lane uni-directional) travels the longer distance. By making the PCIe Gen6 signal longer, the signal can travel over PCB given that PCIe Gen6 has better signal integrity than the higher speed 200G Ethernet/InfiniBand signal.

PCB vs Flyover Cables

② Atomic Claim

在 GB200／GB300 中，GPU／CPU 與 CX-7/8 之間的 PCIe signal distance，比 CX-7/8 與 OSFP cages 之間的 Ethernet／InfiniBand signal distance 更短。

• Epistemic Mode: ASSERTED
• Mapping Status: PARTIAL

③ Semantic Frame

{
  "attribute": "UNSPECIFIED_ATTRIBUTE",
  "context_nodes": [
    {
      "id": "04_knowledge_base/GB300",
      "label": "GB300"
    },
    {
      "id": "04_knowledge_base/GPU",
      "label": "GPU"
    },
    {
      "id": "04_knowledge_base/CPU",
      "label": "CPU"
    },
    {
      "id": "04_knowledge_base/PCIe",
      "label": "PCIe"
    },
    {
      "id": "04_knowledge_base/OSFP (Octal Small Form-factor Pluggable)",
      "label": "OSFP"
    },
    {
      "id": "04_knowledge_base/Ethernet",
      "label": "Ethernet"
    },
    {
      "id": "04_knowledge_base/InfiniBand",
      "label": "InfiniBand"
    }
  ],
  "entity": {
    "id": "04_knowledge_base/GB200",
    "label": "GB200"
  },
  "frame_type": "ATTRIBUTE",
  "qualifiers": {
    "condition_text": null,
    "numeric_mentions": [
      "7",
      "8"
    ],
    "temporal_mentions": []
  },
  "value": {
    "numeric_mentions": [
      "7",
      "8"
    ],
    "value_text": "在 GB200／GB300 中，GPU／CPU 與 CX-7/8 之間的 PCIe signal distance，比 CX-7/8 與 OSFP cages 之間的 Ethernet／InfiniBand signal distance 更短。"
  }
}

④ Canonical Entity Mapping

Role	Surface Label	Canonical Target
entity	GB200	GB200
context_0	GB300	GB300
context_1	GPU	GPU
context_2	CPU	CPU
context_3	PCIe	PCIe
context_4	OSFP	04_knowledge_base/OSFP (Octal Small Form-factor Pluggable)
context_5	Ethernet	Ethernet
context_6	InfiniBand	InfiniBand

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。