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X AI 73728 GB200 NVL72 CX-7 Hyperscaler Ethernet Cluster Configuration
XAI-GB200 NVL72-CX7-SX5-3L
X AI · GB200 · CX-7
Rack type
NVL72
Cluster / location
Default Neocloud GB200 SpectrumX Cluster
Buyer profile
Hyperscaler
Networking type
Ethernet
Number of XPUs
73,728
NIC used
CX-7
NICs / XPU
1
Scale-out BW / XPU
400G
XPU / server
72
Scale-up network
8 rows
Assigned blockDefault
GB200 - NVL72
Scale-UpXPU: GB200 NVL728 linesshared by 10 SKUs
Scale-up Units are based on the scale-up world size (72 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 | 7,200 | 18 | 400 |
| Scale-Up World Size | · | 72 | 518,400 | · | · |
Switches
2
SW| Scale-Up Network Layer | Part / Model | Units# | Unit BWGbit/s uni-d | Lane Count# | Lane BWGbit/s uni-d |
|---|---|---|---|---|---|
| per Switch | Nvidia NVSwitch 5.0 (NVLink 5) | 18 | 28,800 | 72 | 400 |
| Scale-Up Switch Total | · | 18 | 518,400 | · | · |
Connections & cabling
8
CN| Scale-Up Network Layer | Part / Model | Units# | BW / PortGbit/s uni-d | Unit DP# | DP / Port# | Total DPs# | BW / Connector | Cable / Model | Cable Units# |
|---|---|---|---|---|---|---|---|---|---|
| Ultrapass to Switch | NV 2 UltraPass OverPass 144 DP 224Gb/s | 36 | 400 | 144 | 4 | 5,184 | 14,400 | · | · |
| Male Connectors | NV Paladin HD2 224Gb/s 144 DP (Male) | 36 | 400 | 144 | 4 | 5,184 | 14,400 | Already Counted Below | · |
| Female Connectors | NV Paladin HD2 224Gb/s 144 DP (Female) | 36 | 400 | 144 | 4 | 5,184 | 14,400 | Already Counted Below | · |
| Switch Total | ** Two connectors per switch | · | · | · | · | · | 28,800 | · | · |
| Male Connectors | NV Paladin HD2 224Gb/s 72 DP (Male) | 72 | 400 | 72 | 4 | 5,184 | 7,200 | Already Counted Below | · |
| Female Connectors | NV Paladin HD2 224Gb/s 72 DP (Female) | 72 | 400 | 72 | 4 | 5,184 | 7,200 | NV 224Gb/s SkewClear EXD Gen 2 Cable | 5,184 |
| XPU Total | ** One connector per GPU | · | · | · | · | · | 7,200 | · | · |
| · | NVL Spine Chassis (NvLink 5) | 2 | · | · | · | · | · | · | · |
Scale-Up Parts Summary
8
| Item | Qty/Cluster | Qty/Server | Attach/XPU |
|---|---|---|---|
| Nvidia NVSwitch 5.0 (NVLink 5) | 18,432 | 18.00 | 0.25 |
| NV 2 UltraPass OverPass 144 DP 224Gb/s | 36,864 | 36.00 | 0.50 |
| NV Paladin HD2 224Gb/s 144 DP (Male) | 36,864 | 36.00 | 0.50 |
| NV Paladin HD2 224Gb/s 144 DP (Female) | 36,864 | 36.00 | 0.50 |
| NV Paladin HD2 224Gb/s 72 DP (Male) | 73,728 | 72.00 | 1.00 |
| NV Paladin HD2 224Gb/s 72 DP (Female) | 73,728 | 72.00 | 1.00 |
| NV 224Gb/s SkewClear EXD Gen 2 Cable | 5,308,416 | 5,184.00 | 72.00 |
| NVL Spine Chassis (NvLink 5) | 2,048 | 2.00 | 0.03 |
Backend network
5 rows
Assigned blockDefault
GB200 - NVL72 - CX7 - 3L - ETH - SN5610 - XAI
BackendXPU: GB200 NVL725 linesshared by 1 SKU
Backend Units are based on the cluster size (73,728 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 | · | 73,728 | 400 | 400 | 0 | 73,728 | 73,728 | 0 | 73,728 | 73,728 | 0 | 29,491.2 | · |
| NICs per Node | ConnectX-7 NIC - 400G | 4 | 400 | 400 | · | · | 4 | · | · | · | · | · | · |
| ToR | Spectrum-4 51.2T (SN5610) | 2,048 | 51,200 | 800 | 18 | 18 | 64 | 36,864 | 36,864 | 131,072 | 29,491.2 | 29,491.2 | 1 |
| Spine | Spectrum-4 51.2T (SN5610) | 1,152 | 51,200 | 800 | 32 | 32 | 64 | 36,864 | 36,864 | 73,728 | 29,491.2 | 29,491.2 | 1 |
| Core | Spectrum-4 51.2T (SN5610) | 576 | 51,200 | 800 | 64 | · | 64 | 36,864 | 0 | 36,864 | 29,491.2 | 0 | · |
Transceivers
6
CN Network Layer | Transceiver / CablePart Name / Model | Total Units# | Units per SW/GPU# | Unit BWGbit/s | Lanes# | BW per LaneGbit/s | Agg. BWTbit/s |
|---|---|---|---|---|---|---|---|
| XPU Nodes | None - AECs are Used -> | 73,728 | 73,728 | 400 | 4 | 100 | 29,491.2 |
| Leaf | |||||||
| Downlink | Generic 800G DR8 | 36,864 | 32 | 800 | 8 | 100 | 29,491.2 |
| Uplink | Generic 800G DR8 | 36,864 | 32 | 800 | 8 | 100 | 29,491.2 |
| Spine | |||||||
| Downlink | Generic 800G DR8 | 36,864 | 64 | 800 | #ERR | 100 | 0 |
| Uplink | · | · | · | · | · | · | · |
| Core | |||||||
| Downlink | · | · | · | · | · | · | · |
| Uplink | · | · | · | · | · | · | · |
| Super-Core | |||||||
| ToR | |||||||
| Downlink | None - AECs are Used -> | 36,864 | 18 | 800 | 8 | 100 | 29,491.2 |
| Uplink | Generic 800G DR8 | 36,864 | 18 | 800 | 8 | 100 | 29,491.2 |
Cables
6
CB Network Layer | Cable/ FiberType | Total Units# | Units per Transceiver# | Unit BWGbit/s | Lane Count# | SerDes BWGbit/s |
|---|---|---|---|---|---|---|
| XPU Nodes | Generic 800G Y Cable AEC | 36,864 | 0.5 | 800 | 8 | 100 |
| Leaf | ||||||
| Downlink | Already counted above | · | · | · | · | · |
| Uplink | Generic 800G Single Mode | 36,864 | 1 | 800 | 8 | 100 |
| Spine | ||||||
| Downlink | Already counted above | · | · | · | · | · |
| Uplink | · | · | · | · | · | · |
| Core | ||||||
| Downlink | · | · | · | · | · | · |
| Uplink | · | · | · | · | · | · |
| Super-Core | ||||||
| ToR | ||||||
| Downlink | Already counted above | · | · | · | · | · |
| Uplink | Generic 800G Single Mode | 36,864 | 1 | 800 | 8 | 100 |
Backend Parts Summary
5
| Item | Qty/Cluster | Qty/Server | Attach/XPU |
|---|---|---|---|
| Generic 800G Y Cable AEC | 36,864 | 36.00 | 0.50 |
| Generic 800G DR8 | 147,456 | 144.00 | 2.00 |
| Generic 800G Single Mode | 73,728 | 72.00 | 1.00 |
| ConnectX-7 NIC - 400G | 73,728 | 72.00 | 1.00 |
| Spectrum-4 51.2T (SN5610) | 3,776 | 3.69 | 0.05 |
Frontend network
11 rows
Assigned blockDefault
GB200 - NVL72 - Generic BlackBox - XAI
FrontendXPU: GB200 NVL7211 linesshared by 1 SKU
Converged Frontend + Storage Fabric
11
| Layer | Part / Model | Units | Attach / XPU |
|---|---|---|---|
| · | Generic BlackBox 51.2T | 885 | 0.0120 |
| · | Generic BlackBox 12.8T | 4 | 0.0000 |
| · | Generic BlackBox 6.4T | 132 | 0.0018 |
| · | Generic BlackBox 1GbE Ethernet | 1,083 | 0.0147 |
| · | Generic 800G SR8 | 42,814 | 0.5807 |
| · | Generic 400G SR4 | 42,591 | 0.5777 |
| · | Generic 100G SR4 QSFP28 | 18,900 | 0.2563 |
| · | Generic 800G Multimode | 58,595 | 0.7947 |
| · | Generic 400G Multimode | 300 | 0.0041 |
| · | Generic 100G Multimode | 8,419 | 0.1142 |
| · | RJ45 Cables | 51,961 | 0.7048 |
Frontend Parts Summary
11
| Item | Qty/Cluster | Qty/Server | Attach/XPU |
|---|---|---|---|
| Generic BlackBox 51.2T | 885 | 1 | 0.0120 |
| Generic BlackBox 12.8T | 4 | 0 | 0.0001 |
| Generic BlackBox 6.4T | 132 | 0 | 0.0018 |
| Generic BlackBox 1GbE Ethernet | 1,083 | 1 | 0.0147 |
| Generic 800G SR8 | 42,814 | 42 | 0.5807 |
| Generic 400G SR4 | 42,591 | 42 | 0.5777 |
| Generic 100G SR4 QSFP28 | 18,900 | 18 | 0.2563 |
| Generic 800G Multimode | 58,595 | 57 | 0.7947 |
| Generic 400G Multimode | 300 | 0 | 0.0041 |
| Generic 100G Multimode | 8,419 | 8 | 0.1142 |
| RJ45 Cables | 51,961 | 51 | 0.7048 |
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
GB200 - NVL72 - Generic
Compute TrayXPU: GB200 NVL723 linesshared by 10 SKUs
| Tray layer | Part / Model | Units per Tray | Unit BWGb/s | Lanes | Lane BWGb/s | Per switch |
|---|---|---|---|---|---|---|
| XPUs per Tray | Blackwell 200 | 4 | · | · | · | · |
| Bianca Board | NV MCIO PCIe x16 Connector | 2 | · | · | · | · |
| Bianca Board | NV MCIO PCIe x16 Cable | 2 | · | · | · | · |
| Mezz Board to OSFP | NV DensiLink OverPass to OSFP Cage | 4 | · | · | · | · |
Compute Tray Parts Summary
3
| Item | Qty/Cluster | Qty/Server | Attach/XPU |
|---|---|---|---|
| NV MCIO PCIe x16 Connector | 36,864 | 36.00 | 0.50 |
| NV MCIO PCIe x16 Cable | 36,864 | 36.00 | 0.50 |
| NV DensiLink OverPass to OSFP Cage | 73,728 | 72.00 | 1.00 |