NIEK2-0250
① SA Source
- Source: 開啟完整 SA 文章
- Section:
Rubin Ultra NVL288 - Line hint:
309
Context Before
Rubin Ultra NVL288
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
The radix of the 28.8T NVLink Switch limits the number of GPUs that each switch can connect while still providing for cross-rack connectivity. 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. This would also require fewer DPs worth of copper cables.
② Atomic Claim
若部署 Rubin Ultra NVL288，每顆 Rubin Ultra GPU 會有 14.4Tbit/s uni-di scale-up 頻寬，並需要 144 DPs cables 連到 NVLink 7 switches。
- 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": "subject"
},
{
"node": {
"id": "04_knowledge_base/NVL288",
"label": "NVL288"
},
"role": "participant"
},
{
"node": {
"id": "04_knowledge_base/GPU",
"label": "GPU"
},
"role": "participant"
},
{
"node": {
"id": "04_knowledge_base/14.4Tbit per second",
"label": "14.4Tbit/s"
},
"role": "participant"
},
{
"node": {
"id": "04_knowledge_base/NVLink",
"label": "NVLink"
},
"role": "participant"
}
],
"qualifiers": {
"condition_text": null,
"numeric_mentions": [
"14.4Tb",
"144",
"7 s"
],
"temporal_mentions": []
},
"relation_type": "DEPLOYS"
}④ Canonical Entity Mapping
| Role | Surface Label | Canonical Target |
|---|---|---|
| subject | Rubin Ultra | 04_knowledge_base/Rubin Ultra |
| participant | NVL288 | NVL288 |
| participant | GPU | GPU |
| participant | 14.4Tbit/s | 04_knowledge_base/14.4Tbit per second |
| participant | NVLink | 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。