SA260324R-0204::SPLIT01
① SA Source
- Source: 開啟完整 SA 文章
- Section:
Nvidia’s CPO Roadmap - Line hint:
219
Context Before
When we reach the Feynman Generation, CPO usage will expand via another large world size rack, the NVL1152 which is formed by combining 8 Kyber racks. While the Nvidia Technical Blog ↗ that outlines the rack configuration roadmap states that “NVIDIA Kyber will scale up into a massive all-to-all NVL1152 supercomputer using similar direct optical interconnects for rack-to-rack scale-up”, Jensen Huang in a Financial Analyst Q+A session did say that NVL1152 in Feynman would be “all CPO”. There is some disagreement on whether copper will still be used for scale-up within the rack or whether CPO will replace copper.
Nvidia’s approach has been to use copper where they can, and optics where they must. The architecture of NVL1152 in the Feynman generation will follow the same principle. It is clear that the NVL1152 will adopt CPO to connect between racks, but from GPUs to NVLink Switches is currently copper POR. Nvidia is unable to achieve another doubling of electrical lane speed from 224Gbit/s bi-di to 448Gbit/s uni-di means bandwidth isn’t that amazing.
Evidence
While 448G high speed SerDes have big challenges for shoreline, reach, and power versus using a die-to-die connection to an optical engine, the manufacturing challenges, cost, and reliability for Feynman necessitate using copper to the Switch.
Context After
With that said, the NVL1152 SKU is years out – and the roadmap is highly likely to shift. For now, our base case stands at copper being used within each rack and CPO between the racks, but this could easily change.
For now – our best estimate of Nvidia’s CPO roadmap is as follows:
② Atomic Claim
448G high-speed SerDes 相較以 die-to-die 方式連到 optical engine，在 shoreline、reach 與 power 上面臨很大挑戰。
- Epistemic Mode:
ASSERTED - Mapping Status:
COMPLETE
③ Semantic Frame
{
"attribute": "448G_SHORELINE_REACH_AND_POWER_CHALLENGES",
"context_nodes": [
{
"id": "04_knowledge_base/Die-to-die interconnect",
"label": "die-to-die"
},
{
"id": "04_knowledge_base/Optical Engine",
"label": "optical engine"
}
],
"entity": {
"id": "04_knowledge_base/SerDes",
"label": "SerDes"
},
"frame_type": "ATTRIBUTE",
"qualifiers": {
"condition_text": null,
"numeric_mentions": [
"448G"
],
"temporal_mentions": []
},
"value": {
"numeric_mentions": [
"448G"
],
"value_text": "448G high-speed SerDes faces major shoreline, reach, and power challenges versus die-to-die optical-engine attachment."
}
}④ Canonical Entity Mapping
| Role | Surface Label | Canonical Target |
|---|---|---|
| entity | SerDes | SerDes |
| context_0 | die-to-die | 04_knowledge_base/Die-to-die interconnect |
| context_1 | optical engine | 04_knowledge_base/Optical Engine |
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
448G high-speed SerDes 相較以 die-to-die 方式連到 optical engine，在 shoreline、reach 與 power 上面臨很大挑戰。
V2 Semantic Frame Draft
{
"attribute": "448G_SHORELINE_REACH_AND_POWER_CHALLENGES",
"context_nodes": [
{
"id": "04_knowledge_base/Die-to-die interconnect",
"label": "die-to-die"
},
{
"id": "04_knowledge_base/Optical Engine",
"label": "optical engine"
}
],
"entity": {
"id": "04_knowledge_base/SerDes",
"label": "SerDes"
},
"frame_type": "ATTRIBUTE",
"qualifiers": {
"condition_text": null,
"numeric_mentions": [
"448G"
],
"temporal_mentions": []
},
"value": {
"numeric_mentions": [
"448G"
],
"value_text": "448G high-speed SerDes faces major shoreline, reach, and power challenges versus die-to-die optical-engine attachment."
}
}V2 Revision Metadata Draft
{
"epistemic_mode": "ASSERTED",
"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。