SA260324R-0234
① SA Source
- Source: 開啟完整 SA 文章
- Section:
Oberon and Kyber Updates, Larger World Sizes Introduced, More Networking Updates - Line hint:
283
Context Before
Kyber midplane PCB (GPU side). Source: Nvidia, SemiAnalysis
Evidence
For Rubin Ultra NVL144 Kyber, there will be no CPO used for scale up as we have told clients multiple times ↗, despite rumors from other analysts suggesting scale-up CPO introduction for Kyber. However, optics for NVLink are coming and will be progressively phased in. Scale-up CPO will first be used for the Rubin Ultra NVL 576 system to connect between 8 Oberon form factor racks, forming a two-layer all-to-all network. A copper backplane will still be used for scale-up networking within the racks however. This is still for low volume / testing purposes.
Context After
Moving back to the Kyber Rack, each Rubin Ultra logical GPU offers 14.4Tbit/s uni-di of scale-up bandwidth, using an 80DP connector (72 DPs used x 200Gbit/s bi-di channel = 14.4Tbit/s) per GPU for connectivity to the midplane board. Connecting all 144 GPUs in an all-to-all network will require 72 NVLink 7.0 Switch Chips running at 28.8Tbit/s uni-di of aggregate bandwidth each.
② Atomic Claim
In the described Rubin Ultra NVL576 roadmap, scale-up within each Oberon rack retains a copper backplane.
- Epistemic Mode:
EXPECTED - Mapping Status:
COMPLETE
③ Semantic Frame
{
"frame_type": "NARY_RELATION",
"participants": [
{
"node": {
"id": "04_knowledge_base/Scale-up networking",
"label": "scale-up networking"
},
"role": "network_type"
},
{
"node": {
"id": "04_knowledge_base/Copper",
"label": "copper"
},
"role": "material"
},
{
"node": {
"id": "04_knowledge_base/Backplane",
"label": "backplane"
},
"role": "backplane"
}
],
"qualifiers": {
"condition_text": "within racks",
"numeric_mentions": [],
"temporal_mentions": []
},
"relation_type": "INTRA_RACK_SCALEUP_USES_COPPER_BACKPLANE"
}④ Canonical Entity Mapping
| Role | Surface Label | Canonical Target |
|---|---|---|
| network_type | scale-up networking | 04_knowledge_base/Scale-up networking |
| material | copper | Copper |
| backplane | backplane | Backplane |
⑤ V2 Draft（需要修正時直接編輯）
Inline repair
只編輯以下三個 Draft 區塊。完成後將
review_action設為REQUEST_REPAIR，再手動執行 Repair Preview。
執行腳本前，Draft 不會寫入 Claim Store 或 Graph。
V2 Atomic Claim Draft
In the described Rubin Ultra NVL576 roadmap, scale-up within each Oberon rack retains a copper backplane.
V2 Semantic Frame Draft
{
"frame_type": "NARY_RELATION",
"participants": [
{
"node": {
"id": "04_knowledge_base/Scale-up networking",
"label": "scale-up networking"
},
"role": "network_type"
},
{
"node": {
"id": "04_knowledge_base/Copper",
"label": "copper"
},
"role": "material"
},
{
"node": {
"id": "04_knowledge_base/Backplane",
"label": "backplane"
},
"role": "backplane"
}
],
"qualifiers": {
"condition_text": "within racks",
"numeric_mentions": [],
"temporal_mentions": []
},
"relation_type": "INTRA_RACK_SCALEUP_USES_COPPER_BACKPLANE"
}V2 Revision Metadata Draft
{
"epistemic_mode": "EXPECTED",
"mapping_status": "COMPLETE"
}⑥ 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。