SA260324R-0325
① SA Source
- Source: 開啟完整 SA 文章
- Section:
Feynman NVL1152 Networking Topologies - Line hint:
406
Context Before
To double the scale-up bandwidth using copper interconnect, NVIDIA would have to achieve a per lane bandwidth of 448Gbit/s uni-di (and implemented with simultaneous bi-directional SerDes so that each physical channel carries 448G of RX and 448G of TX). However, this is a challenging feat as they would first have to prove the feasibility of 448Gb/s PAM4 SerDes at large volumes, then implement echo cancellation to achieve bidirectional bandwidth, which is in itself extremely difficult.
Evidence
We believe Nvidia is going for 448G uni-di only.
Context After
Feynman could use in-rack optics, where switch blades are blind-mated to the midplane using optical connectors and thin fiber strands can be used to connect the optical connectors to the NVLink 8 Switches in place of flyover cables, but we believe this is very unlikely.
② Atomic Claim
SemiAnalysis 判斷 Nvidia 會採 448G uni-di only。
- Epistemic Mode:
EXPECTED - Mapping Status:
PARTIAL
③ Semantic Frame
{
"attribute": "EXPECTED_LANE_DIRECTION_AND_RATE",
"context_nodes": [],
"entity": {
"id": "02_companies/NVDA",
"label": "Nvidia"
},
"frame_type": "ATTRIBUTE",
"qualifiers": {
"condition_text": "analyst belief",
"numeric_mentions": [
"448G"
],
"temporal_mentions": []
},
"value": {
"numeric_mentions": [
"448G"
],
"value_text": "預期採 448G uni-di only。"
}
}④ Canonical Entity Mapping
| Role | Surface Label | Canonical Target |
|---|---|---|
| entity | Nvidia | NVDA |
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。