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Amazon 131040 Trainium4 - UALink Nitro-v6 Hyperscaler EFA Cluster Configuration
AWS-Trn4 EFA-WB
Amazon · Trainium4 · Nitro-v6
Rack type
UALink
Cluster / location
Trainium4 - UALink
Buyer profile
Hyperscaler
Networking type
EFA
Number of XPUs
131,040
NIC used
Nitro-v6
NICs / XPU
1
Scale-out BW / XPU
800G
XPU / server
144
Scale-up network
5 rows
Assigned blockDefault
Trainium4 - UALink
Scale-UpXPU: Trainium4 UALink5 linesshared by 1 SKU
Scale-up Units are based on the scale-up world size (144 XPUs).
XPU World Size
2
WS| Scale-Up Network Layer | Part / Model | Units# | Unit BWGbit/s uni-d | Lane Count# | Lane BWGbit/s uni-d |
|---|---|---|---|---|---|
| XPUs per Node | · | 4 | · | · | · |
| Scale-Up World Size | · | 144 | · | · | · |
Switches
2
SW| Scale-Up Network Layer | Part / Model | Units# | Unit BWGbit/s uni-d | Lane Count# | Lane BWGbit/s uni-d |
|---|---|---|---|---|---|
| per Switch | Astera Labs UALink 57.6T Switch | 1 | 57,600 | 288 | 200 |
| Scale-Up Switch Total | Astera Labs UALink 57.6T Switch | 64 | 3,686,400 | · | · |
Connections & cabling
8
CN| Scale-Up Network Layer | Part / Model | Units# | BW / LaneGbit/s uni-d | Unit DP# | DP / Lane# | Total DPs# | BW / Connector | Cable / Model | Cable Units# |
|---|---|---|---|---|---|---|---|---|---|
| Male Connectors | Paladin HD2 224Gb/s 144 DP (Male) | 128 | 200 | 144 | 2 | 18,432 | 14,400 | Already Counted Below | · |
| Female Connectors | Paladin HD2 224Gb/s 144 DP (Female) | 128 | 200 | 144 | 2 | 18,432 | 14,400 | 112Gb/s SkewClear EXD Cable | 18,432 |
| Switch Total | ** Four Connectors per Switch | · | · | · | · | · | · | · | · |
| Male Connectors | Paladin HD2 224Gb/s 144 DP (Male) | 144 | 200 | 144 | 2 | 20,736 | 14,400 | Already Counted Below | · |
| Female Connectors | Paladin HD2 224Gb/s 144 DP (Female) | 144 | 200 | 144 | 2 | 20,736 | 14,400 | Already Counted Below | · |
| XPU Total | ** Two Connectors per XPU | · | · | · | · | · | · | · | · |
| Between Racks | Generic 1.6T AEC | 0 | 200 | · | · | · | · | · | · |
| · | Teton4 Backplane Chassis | 2 | · | · | · | · | · | · | · |
Notes
- Male Connectors · Paladin HD2 224Gb/s 144 DP (Male) — 4 per Switch
- Male Connectors · Paladin HD2 224Gb/s 144 DP (Male) — 2 per GPU
PCIe Lane Math
PCIe Lane Math
19
PCIe lane accounting for the Trainium scale-up domain. Values behave like spreadsheet cells: type = to start a formula, then click other Value cells to link them (hard-coded values read blue, pure cell links read white).
| Section | Metric | Value# | Note |
|---|---|---|---|
| · | Lanes per Connector pair | 72 | · |
| · | Total Lanes per Switch | 288 | · |
| · | Redundant Lanes | 0 | · |
| · | Switch Tray Paladin Units per Chip | 4 | · |
| · | DP per Connector pair | 144 | · |
| · | DP per Lane | 2 | · |
| · | Lanes per Connector pair | 72 | · |
| · | Backplane Lanes per Chip | 144 | · |
| · | Spare Lanes | 0 | · |
| · | XPU Strada Whisper Units per Chip | 2 | · |
| (a) | Number of Chips | 144 | · |
| · | AEC Lanes per Chip | 0 | 0 |
| · | Lanes per AEC | 8 | · |
| · | AEC Units per (a) | 0 | 2 AEC ends per Tn4, so 288 total for two racks, but 1 AEC has two ends, so its 144 AECs. |
| · | · | · | ** Zeroing this out - no scale-up AEC to be used. |
| · | Backplane Lanes | 64 | · |
| · | AEC Lanes | 0 | · |
| · | PCB Lanes | 64 | · |
| · | Total Lanes per Trainium | 128 | · |
Scale-Up Parts Summary
5
| Item | Qty/Cluster | Qty/Server | Attach/XPU |
|---|---|---|---|
| Astera Labs UALink 57.6T Switch | 58,240 | 64.00 | 0.44 |
| Paladin HD2 224Gb/s 144 DP (Male) | 247,520 | 272.00 | 1.89 |
| Paladin HD2 224Gb/s 144 DP (Female) | 247,520 | 272.00 | 1.89 |
| 112Gb/s SkewClear EXD Cable | 16,773,120 | 18,432.00 | 128.00 |
| Teton4 Backplane Chassis | 1,820 | 2.00 | 0.01 |
Backend network
5 rows
Assigned blockDefault
Trainium4 - UALink - Nitro - 3L - ETH - TH5 - AWS
BackendXPU: Trainium4 UALink5 linesshared by 1 SKU
Backend Units are based on the cluster size (131,040 XPUs).
Switches
5
SW Network Layer | Switch and Server Spec | Aggregate Port Utilization | Network Bandwidth Aggregate | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
SwitchPart Name / Model | Units# | Unit BWGbit/s | Port BWGbit/s | Downlink Ports / SW# | Uplink Ports / SW# | Max Ports# | Downlink Ports# | Uplink Ports# | Total Ports# | Downlink BWTbit/s | Uplink BWTbit/s | OversubRatio | |
| XPUs | · | 131,040 | 800 | 100 | 0 | 1,048,320 | 1,048,320 | 0 | 1,048,320 | 1,048,320 | 0 | 104,832 | · |
| NICs per Node | Nitro-v7 800G NIC | 4 | 800 | 100 | · | · | 8 | · | · | · | · | · | · |
| ToR | WhiteBox Tomahawk 5 51.2T | 4,095 | 51,200 | 400 | 64 | 64 | 128 | 262,080 | 262,080 | 524,160 | 104,832 | 104,832 | 1 |
| Leaf | WhiteBox Tomahawk 5 51.2T | 4,095 | 51,200 | 400 | 64 | 64 | 128 | 262,080 | 262,080 | 524,160 | 104,832 | 104,832 | 1 |
| Spine | WhiteBox Tomahawk 5 51.2T | 2,047.5 | 51,200 | 400 | 128 | 0 | 128 | 262,080 | 0 | 262,080 | 104,832 | 0 | · |
Transceivers
8
CN Network Layer | Transceiver / CablePart Name / Model | Total Units# | Units per SW/GPU# | Unit BWGbit/s | Lanes# | BW per LaneGbit/s | Agg. BWTbit/s |
|---|---|---|---|---|---|---|---|
| GPU Nodes | None - AECs are Used -> | 131,040 | 131,040 | 800 | 4 | 200 | 104,832 |
| CPU Nodes | None - AECs are Used -> | 32,760 | · | · | · | · | · |
| Leaf | |||||||
| Downlink | Generic 800G DR8 | 131,040 | 32 | 800 | 8 | 100 | 104,832 |
| Uplink | Generic 800G DR8 | 131,040 | #ERR | 800 | #ERR | 100 | 0 |
| Spine | |||||||
| Downlink | Generic 800G DR8 | 131,040 | #ERR | 800 | #ERR | 100 | 0 |
| Uplink | · | · | · | · | · | · | · |
| Core | |||||||
| Downlink | · | · | · | · | · | · | · |
| Uplink | · | · | · | · | · | · | · |
| Super-Core | |||||||
| ToR | |||||||
| Downlink | None - AECs are Used -> | 131,040 | 32 | 800 | 8 | 100 | 104,832 |
| Uplink | Generic 800G DR8 | 131,040 | 32 | 800 | 8 | 100 | 104,832 |
Cables
8
CB Network Layer | Cable/ FiberType | Total Units# | Units per Transceiver# | Unit BWGbit/s | Lane Count# | SerDes BWGbit/s |
|---|---|---|---|---|---|---|
| GPU Nodes | Generic 800G AEC | 131,040 | 1 | 800 | 8 | 100 |
| CPU Nodes | · | · | · | · | · | · |
| Leaf | ||||||
| Downlink | Already counted above | · | · | · | · | · |
| Uplink | Generic 800G Single Mode | 131,040 | 1 | 800 | 8 | 100 |
| Spine | ||||||
| Downlink | · | · | · | · | · | · |
| Uplink | · | · | · | · | · | · |
| Core | ||||||
| Downlink | · | · | · | · | · | · |
| Uplink | · | · | · | · | · | · |
| Super-Core | ||||||
| ToR | ||||||
| Downlink | Already counted above | · | · | · | · | · |
| Uplink | Generic 800G Single Mode | 131,040 | 1 | 800 | 8 | 100 |
Backend Parts Summary
5
| Item | Qty/Cluster | Qty/Server | Attach/XPU |
|---|---|---|---|
| Generic 800G AEC | 131,040 | 144.00 | 1.00 |
| Nitro-v7 800G NIC | 131,040 | 144.00 | 1.00 |
| Generic 800G DR8 | 524,160 | 576.00 | 4.00 |
| Generic 800G Single Mode | 262,080 | 288.00 | 2.00 |
| WhiteBox Tomahawk 5 51.2T | 10,238 | 11.25 | 0.08 |
Frontend network
No converged frontend + storage fabric data for this cluster.
Frontend Parts Summary
0
| Item | Qty/Cluster | Qty/Server | Attach/XPU |
|---|
Compute Tray Networking Content
3 rows
Networking components inside the compute tray — accelerators, board-to-board connectors, retimers, and their per-tray bandwidth.
Assigned blockDefault
Trainium4 - UALink - AWS
Compute TrayXPU: Trainium4 UALink3 linesshared by 1 SKU
| Tray layer | Part / Model | Units per Tray | Unit BWGb/s | Lanes | Lane BWGb/s | Per switch |
|---|---|---|---|---|---|---|
| XPUs per Tray | Trainium4 | · | · | · | · | 4 |
| To Front End CPU (PCIe 5.0) | Astera Labs Scorpio-P 32-Lane PCIe Gen 6.0 | · | · | · | · | 2 |
| To Front End CPU (PCIe 5.0) | Aries PG6032 16L/32L Gearbox | · | · | · | · | 2 |
| · | Aries PCIe 7.0 x16 Retimer | · | · | · | · | 4 |
Compute Tray Parts Summary
3
| Item | Qty/Cluster | Qty/Server | Attach/XPU |
|---|---|---|---|
| Astera Labs Scorpio-P 32-Lane PCIe Gen 6.0 | · | · | · |
| Aries PG6032 16L/32L Gearbox | · | · | · |
| Aries PCIe 7.0 x16 Retimer | · | · | · |