NIEK2-0228
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
Rubin Ultra NVL144 Kyber 的 scale-up 不會使用 CPO；SemiAnalysis 曾多次向客戶說明這點，儘管其他分析師曾傳出 Kyber 將導入 scale-up CPO 的消息。
- Epistemic Mode:
ASSERTED - Mapping Status:
PARTIAL
③ Semantic Frame
{
"frame_type": "NARY_RELATION",
"participants": [
{
"node": {
"id": "04_knowledge_base/Rubin Ultra",
"label": "Rubin Ultra"
},
"role": "user_or_subject"
},
{
"node": {
"id": "04_knowledge_base/NVL144",
"label": "NVL144"
},
"role": "used_entity"
},
{
"node": {
"id": "04_knowledge_base/NVIDIA Kyber Rack",
"label": "Kyber"
},
"role": "used_entity"
},
{
"node": {
"id": "04_knowledge_base/CPO",
"label": "CPO"
},
"role": "used_entity"
}
],
"qualifiers": {
"condition_text": null,
"numeric_mentions": [],
"temporal_mentions": []
},
"relation_type": "USES"
}④ Canonical Entity Mapping
| Role | Surface Label | Canonical Target |
|---|---|---|
| user_or_subject | Rubin Ultra | 04_knowledge_base/Rubin Ultra |
| used_entity | NVL144 | NVL144 |
| used_entity | Kyber | 04_knowledge_base/NVIDIA Kyber Rack |
| used_entity | CPO | CPO |
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。