2025-06-13_amd-advancing-ai-mi350x-and-mi400-ualoe72-mi500-ual256::AMD25-0008
① SA Source
- Source: 開啟完整 SA 文章
- Section:
Executive Summary - Line hint:
65
Context Before
The MI400 Series racks are not actually using real UALink for scale-up networking. AMD has instead renamed its Infinity Fabric Over Ethernet to “UALink over Ethernet” and uses this for its scale-up network
Evidence
The MI400 Series scale-up network will use Broadcom Ethernet Tomahawk 6 switches because Marvell and Astera Labs’ UALink switches will not be ready by late 2026
Context After
Despite these earlier points, the MI400 Series with UALink over Ethernet will still be competitive with the VR200 NVL144’s NVLink in terms of scale up bandwidth and also has a scale up world size of 72 logical GPUs
② Atomic Claim
MI400 scale-up network 預計使用 Broadcom Tomahawk 6 Ethernet switches，因 Marvell/Astera UALink switches 到 late-2026 尚未 ready。
- 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": "02_companies/AVGO",
"label": "Broadcom"
},
"role": "supplier"
},
{
"node": {
"id": "04_knowledge_base/Tomahawk 6",
"label": "Tomahawk 6"
},
"role": "switch"
},
{
"node": {
"id": "04_knowledge_base/Ethernet",
"label": "Ethernet"
},
"role": "transport"
},
{
"node": {
"id": "02_companies/Marvell",
"label": "Marvell"
},
"role": "alternative_supplier"
},
{
"node": {
"id": "04_knowledge_base/UALink",
"label": "UALink"
},
"role": "protocol"
}
],
"qualifiers": {
"condition_text": "late 2026",
"numeric_mentions": [
"2026"
],
"temporal_mentions": []
},
"relation_type": "MI400_SCALE_UP_SWITCH"
}④ Canonical Entity Mapping
| Role | Surface Label | Canonical Target |
|---|---|---|
| system | MI400 | MI400 |
| supplier | Broadcom | AVGO |
| switch | Tomahawk 6 | 04_knowledge_base/Tomahawk 6 |
| transport | Ethernet | Ethernet |
| alternative_supplier | Marvell | Marvell |
| 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。