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Google 134400 TPUv8t - Mediatek NIC - 200G Hyperscaler Ethernet Cluster Configuration

GOOG-TPUv8t-1.6T-Eth-WB-9216

Google · TPUv8t - Mediatek · NIC - 200G

Rack type
—
Cluster / location
TPUv8t 3D Torus Cluster - 1.6T Version
Buyer profile
Hyperscaler
Networking type
Ethernet
Number of XPUs
134,400
NIC used
NIC - 200G
NICs / XPU
1
Scale-out BW / XPU
200G
XPU / server
9,216

Scale-up network

Assigned blockDefault
TPUv8t - Mediatek
Scale-UpXPU: TPUv8t - Mediatek0 linesshared by 1 SKU

Scale-up Units are based on the scale-up world size (9,216 XPUs).

XPU World Size

2
WS
Scale-Up Network LayerPart / Model
Units#
Unit BWGbit/s uni-d
Lane Count#
Lane BWGbit/s uni-d
XPUs per Node·9,216···
Scale-Up World Size·9,216···

Switches

2
SW
Scale-Up Network LayerPart / Model
Units#
Unit BWGbit/s uni-d
Lane Count#
Lane BWGbit/s uni-d
per World300x300 Port OCS48···
per Scale-Up·672···

Google ICI Networking

3D Torus Worksheet
18

Scale-Up Network Worksheet (per Scale-Up World Size) — per-TPU ICI connectivity by connector type, from the config workbook.

ConnectorPart / ModelTPUs
per TPU Units#
Units#
Unit BWGbit/s
Lane Count#
SerDes BWGbit/s
Attach Ratio# per GPU
Cluster Total#
TPU Rack32
Interior TPUs4
Copper Cable1.6T Copper481,6008200
PCBPCB24
Optical1.6T FR8001,6008200
Corner TPUs4
Copper Cable1.6T Copper121,6008200
PCBPCB24
Optical1.6T FR83121,6008200
Edge TPUs12
Copper Cable1.6T Copper2121,6008200
PCBPCB212
Optical1.6T FR82241,6008200
Face TPUs12
Copper Cable1.6T Copper3181,6008200
PCBPCB212
Optical1.6T FR81121,6008200
Total for TPU Rack32
Copper Cable1.6T Copper401,6008200
ActiveGeneric 1.6T ACC131,60082000.4154,600
PassiveGeneric 1.6T DAC271,60082000.84113,400
PCBPCB28
Optical1.6T FR8481,60082001.5201,600
We assume 1.6T FR8, which means we need two single mode cables per each transceiver

Scale-Up Parts Summary

3
ItemQty/ClusterQty/ServerAttach/XPU
Generic 1.6T ACC54,6003,744.000.41
Generic 1.6T DAC113,4007,776.000.84
1.6T FR8201,60013,824.001.50

Backend network

6 rows
Assigned blockDefault
TPUv8t - Mediatek - 200G NIC - 4L - ETH - TH3 - GOOG
BackendXPU: TPUv8t - Mediatek6 linesshared by 1 SKU

Backend Units are based on the cluster size (134,400 TPUs).

Switches

7
SW
 Network Layer
Switch and Server SpecAggregate Port UtilizationNetwork 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
TPUs·134,4002002000134,400134,4000134,400134,400026,880·
TPUs per Node·4····1······
NICs per NodeNIC - 200G2200200··1······
ToRWhiteBox Tomahawk 3 12.8T4,60812,80020016166473,72873,728294,91214,745.614,745.61
LeafWhiteBox Tomahawk 4 25.6T1,15225,600200646412873,72873,728147,45614,745.614,745.61
SpineWhiteBox Tomahawk 4 25.6T1,15225,600200646412873,72873,728147,45614,745.614,745.61
4 Aggregation Blocks
Core300x300 Port OCS256·200288288073,72873,728014,745.614,745.61

Transceivers

10
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 NodesGeneric 200G DR4 QSFP56134,400134,40020045026,880
Leaf
DownlinkGeneric 200G DR4 QSFP5673,7286420045014,745.6
UplinkGeneric 200G DR4 QSFP5673,7286420045014,745.6
Spine
DownlinkGeneric 200G DR4 QSFP5673,72864200#ERR5014,745.6
UplinkGeneric 200G FR473,72864200#ERR5014,745.6
Core
Downlink·73,728288200··0
Uplink·73,728288200··14,745.6
Super-CoreOCS is Circular, 288 North, 288 South······
ToR
DownlinkGeneric 200G DR4 QSFP5673,7281620045014,745.6
UplinkGeneric 200G DR4 QSFP5673,7281620045014,745.6

Cables

10
CB
 Network Layer
Cable/ FiberType
Total Units#
Units per Transceiver#
Unit BWGbit/s
Lane Count#
SerDes BWGbit/s
XPU NodesGeneric 200G Single Mode134,4001200450
Leaf
DownlinkAlready counted above·····
UplinkGeneric 200G Single Mode73,7281200450
Spine
DownlinkAlready counted above·····
Uplink·73,7281200450
Core
DownlinkAlready counted above·····
Uplink······
Super-Core······
ToR
DownlinkAlready counted above·····
UplinkGeneric 200G Single Mode73,7281200450

Backend Parts Summary

6
ItemQty/ClusterQty/ServerAttach/XPU
Generic 200G DR4 QSFP56503,04034,494.173.74
Generic 200G Single Mode281,85619,327.272.10
NIC - 200G292.000.00
WhiteBox Tomahawk 3 12.8T4,608315.980.03
WhiteBox Tomahawk 4 25.6T2,304157.990.02
Generic 200G FR473,7285,055.630.55

Frontend network

No converged frontend + storage fabric data for this cluster.

Frontend Parts Summary

0
ItemQty/ClusterQty/ServerAttach/XPU

Compute Tray Networking Content

1 rows

Networking components inside the compute tray — accelerators, board-to-board connectors, retimers, and their per-tray bandwidth.

Assigned blockDefault
TPUv8t - Mediatek - GOOG
Compute TrayXPU: TPUv8t - Mediatek1 lineshared by 1 SKU
Tray layerPart / ModelUnits per Tray
Unit BWGb/s
Lanes
Lane BWGb/s
Per switch
XPUs per TrayTPUv7x (Ironwood)4····
TPU Tray to Host TrayPCIe 5.0 x16 Cable4512···

Compute Tray Parts Summary

1
ItemQty/ClusterQty/ServerAttach/XPU
PCIe 5.0 x16 Cable134,4009,216.001.00