2025-06-13_amd-advancing-ai-mi350x-and-mi400-ualoe72-mi500-ual256::AMD25-0018
① SA Source
- Source: 開啟完整 SA 文章
- Section:
The MI400 Series is UALoE and Not UALink - Line hint:
309
Context Before
In the following sections, we will dive much deeper into the MI400 true rack-scale solution, discussing key scale-up architecture choices, explaining the full rack design with the help of elevation diagrams and board design illustrations. We will also provide a detailed bill of materials breakdown and a total cost of ownership and performance per TCO analysis.
The MI400 Series is UALoE and Not UALink
Evidence
The MI400 Series will be using 102.4T Broadcom Tomahawk 6 Ethernet switches and will run the UALink protocol on top of Ethernet.
Context After
“UALink tunneled over standard Ethernet” – Lisa Su
The reason why AMD could not deploy actual UALink is that UALink switches from Astera Labs and Marvell don’t come until 2027, and Broadcom did not want to develop an actual UALink switch.
② Atomic Claim
MI400 Series 將使用 102.4T Broadcom Tomahawk 6 Ethernet switches，並在 Ethernet 上跑 UALink protocol。
- Epistemic Mode:
EXPECTED - Mapping Status:
COMPLETE
③ Semantic Frame
{
"frame_type": "NARY_RELATION",
"participants": [
{
"node": {
"id": "04_knowledge_base/MI400",
"label": "MI400"
},
"role": "system"
},
{
"node": {
"id": "04_knowledge_base/Tomahawk 6",
"label": "Tomahawk 6"
},
"role": "switch"
},
{
"node": {
"id": "04_knowledge_base/Ethernet",
"label": "Ethernet"
},
"role": "transport"
},
{
"node": {
"id": "04_knowledge_base/UALink",
"label": "UALink"
},
"role": "protocol"
}
],
"qualifiers": {
"condition_text": null,
"numeric_mentions": [
"102.4T"
],
"temporal_mentions": []
},
"relation_type": "MI400_UALOE_IMPLEMENTATION"
}④ Canonical Entity Mapping
| Role | Surface Label | Canonical Target |
|---|---|---|
| system | MI400 | MI400 |
| switch | Tomahawk 6 | 04_knowledge_base/Tomahawk 6 |
| transport | Ethernet | Ethernet |
| protocol | UALink | UALink |
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。