VR2R-0571_r1

VR2R-0571

① SA Source

• Source: 開啟完整 SA 文章
• Section: Scale-Up Network - NVLink 6
• Line hint: 476

Context Before

While the VR NVL72 system features GPUs and scale-up switches that are connected by copper cables, the VR HGX system features servers consisting of eight Rubin GPUs and four NVLink Switch chips. The second meaningful difference between the NVL72 and HGX deployments is that the former has a scale-out bandwidth of 1.6T per GPU while the latter only has a scale-out bandwidth of 800G per GPU.

Evidence

The HGX Rubin NVL8 server consists of eight 800G CX-9 NIC packages—one NIC per GPU—which means that the scale-out bandwidth does not increase from its predecessor, the HGX B300 server.

Context After

The Vera Rubin NVL72 deployment on the other hand doubles the per GPU scale-out bandwidth to 1.6T, but not by doubling the bandwidth per NIC. Rather, the “1.6T NIC” attached to each Rubin chip is comprised of two 800G CX-9 packages that is connected to the Vera CPU by PCIe Gen 6.0 lanes.

② Atomic Claim

HGX Rubin NVL8 server 配置 8 個 800G CX-9 NIC packages，每顆 GPU 對應 1 個 NIC；因此 scale-out bandwidth 並未高於前一代 HGX B300 server。

• Epistemic Mode: ASSERTED
• Mapping Status: COMPLETE

③ Semantic Frame

{
  "frame_type": "NARY_RELATION",
  "participants": [
    {
      "node": {
        "id": "04_knowledge_base/HGX",
        "label": "HGX"
      },
      "role": "platform"
    },
    {
      "node": {
        "id": "04_knowledge_base/Vera Rubin",
        "label": "Rubin"
      },
      "role": "processor"
    },
    {
      "node": {
        "id": "04_knowledge_base/ConnectX-9",
        "label": "CX-9"
      },
      "role": "nic"
    },
    {
      "node": {
        "id": "04_knowledge_base/NIC",
        "label": "NIC"
      },
      "role": "nic_type"
    },
    {
      "node": {
        "id": "04_knowledge_base/GPU",
        "label": "GPU"
      },
      "role": "gpu_type"
    },
    {
      "node": {
        "id": "04_knowledge_base/NVIDIA B300",
        "label": "B300"
      },
      "role": "predecessor"
    }
  ],
  "qualifiers": {
    "condition_text": "scale-out bandwidth unchanged versus HGX B300 predecessor",
    "numeric_mentions": [
      "8",
      "800G",
      "1"
    ],
    "temporal_mentions": []
  },
  "relation_type": "HGX_RUBIN_NVL8_SCALE_OUT_CONFIGURATION"
}

④ Canonical Entity Mapping

Role	Surface Label	Canonical Target
platform	HGX	HGX
processor	Rubin	04_knowledge_base/Vera Rubin
nic	CX-9	ConnectX-9
nic_type	NIC	NIC
gpu_type	GPU	GPU
predecessor	B300	04_knowledge_base/NVIDIA B300

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。