VR2R-0501
① SA Source
- Source: 開啟完整 SA 文章
- Section:
Rack Level Infrastructure: Power Delivery - Line hint:
412
Context Before
The power shelves step down the power from 415VAC-480VAC to 50VDC and sends it to the busbar. Interestingly, the busbar of VR NVL72 is rated for 5000A+, which is much higher than that of Grace Blackwell at 2900A.
Evidence
Given the extremely high current and the lack of fans in the rack, the busbar has to be liquid cooled.
Context After
For the hyperscale customers, they might choose to deploy a standalone power rack either in LVDC (low voltage direct current) or HVDC (high voltage direct current). Below we provide two possible scenarios of the power rack deployment for VR NVL72.
② Atomic Claim
由於 current 極高且 rack 內沒有 fans，busbar 必須採 liquid cooling。
- Epistemic Mode:
ASSERTED - Mapping Status:
COMPLETE
③ Semantic Frame
{
"additional_nodes": [],
"frame_type": "RELATION",
"object": {
"id": "04_knowledge_base/液冷散熱",
"label": "liquid cooling"
},
"predicate": "REQUIRES",
"qualifiers": {
"condition_text": "because of extremely high current and lack of fans in the rack",
"numeric_mentions": [],
"temporal_mentions": []
},
"subject": {
"id": "04_knowledge_base/Busbar",
"label": "busbar"
}
}④ Canonical Entity Mapping
| Role | Surface Label | Canonical Target |
|---|---|---|
| subject | busbar | Busbar |
| object | liquid cooling | 04_knowledge_base/液冷散熱 |
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。