NIEK2-0254
① SA Source
- Source: 開啟完整 SA 文章
- Section:
Rubin Ultra NVL288 - Line hint:
311
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.
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. 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.
Evidence
Either a higher radix switch will have to be used - or there will have to be a degree of oversubscription in this architecture while potentially adopting a dragonfly-like network topology
Context After
Source: SemiAnalysis
② Atomic Claim
因此要嘛必須採用更高 radix 的 switch，要嘛架構需要一定程度的 oversubscription，並可能採用類似 dragonfly 的 network topology。
- Epistemic Mode:
ASSERTED - Mapping Status:
PARTIAL
③ Semantic Frame
{
"attribute": "ADOPTION_STATUS",
"context_nodes": [],
"entity": {
"id": "04_knowledge_base/Network Topology",
"label": "network topology"
},
"frame_type": "ATTRIBUTE",
"qualifiers": {
"condition_text": null,
"numeric_mentions": [],
"temporal_mentions": []
},
"value": {
"numeric_mentions": [],
"value_text": "因此要嘛必須採用更高 radix 的 switch，要嘛架構需要一定程度的 oversubscription，並可能採用類似 dragonfly 的 network topology。"
}
}④ Canonical Entity Mapping
| Role | Surface Label | Canonical Target |
|---|---|---|
| entity | network topology | 04_knowledge_base/Network Topology |
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。