SA260324R-0252_r1

SA260324R-0252

① SA Source

• Source: 開啟完整 SA 文章
• Section: Rubin Ultra NVL288
• Line hint: 314

Context Before

Though not officially discussed by Nvidia at GTC 2026, an NVL288 concept has been explored within the supply chain. This would entail two NVL144 Kyber racks placed adjacent to each other, with a rack-to-rack copper backplane used to connect the two racks. One possibility is that all 288 GPUs are connected all to all, but this would require higher radix switches than the current NVLink 7 switches which only offer a maximum radix of 144 ports of 200G.

Evidence

If Rubin Ultra NVL288 is deployed, each Rubin Ultra GPU will have a scale-up bandwidth of 14.4Tbit/s uni-di, requiring 144 DPs of cables to connect the NVLink 7 switches.

Context After

72 DPs per GPU times 288 GPUs means a total of 20,736 additional DPs required to connect this larger world size domain. This entails a lot of cables, so it is an upper bound of how much cable content could be used.

② Atomic Claim

若部署 Rubin Ultra NVL288，每顆 Rubin Ultra GPU 會有 14.4Tbit/s uni-di scale-up bandwidth，並需要 144 DPs cable 連接 NVLink 7 switch。

• Epistemic Mode: HYPOTHETICAL
• Mapping Status: PARTIAL

③ Semantic Frame

{
  "frame_type": "NARY_RELATION",
  "participants": [
    {
      "node": {
        "id": "04_knowledge_base/Rubin Ultra",
        "label": "Rubin Ultra"
      },
      "role": "platform"
    },
    {
      "node": {
        "id": "04_knowledge_base/NVL288",
        "label": "NVL288"
      },
      "role": "system"
    },
    {
      "node": {
        "id": "04_knowledge_base/GPU",
        "label": "GPU"
      },
      "role": "compute_device"
    },
    {
      "node": {
        "id": "04_knowledge_base/14.4Tbit per second",
        "label": "14.4Tbit/s"
      },
      "role": "bandwidth"
    },
    {
      "node": {
        "id": "04_knowledge_base/NVLink",
        "label": "NVLink 7"
      },
      "role": "switch_protocol"
    }
  ],
  "qualifiers": {
    "condition_text": "DP cable 沒有 canonical entity；條件為 NVL288 被部署",
    "numeric_mentions": [
      "288",
      "14.4Tbit/s",
      "144"
    ],
    "temporal_mentions": []
  },
  "relation_type": "NVL288_GPU_SCALEUP_REQUIREMENT"
}

④ Canonical Entity Mapping

Role	Surface Label	Canonical Target
platform	Rubin Ultra	04_knowledge_base/Rubin Ultra
system	NVL288	NVL288
compute_device	GPU	GPU
bandwidth	14.4Tbit/s	04_knowledge_base/14.4Tbit per second
switch_protocol	NVLink 7	NVLink

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。