How many accelerators can Arista's rack-scale architecture support?

Arista says the designs support up to 144 accelerators per rack. Its Etherlink SU-144 scales to 1,024 XPUs through cross-rack topologies.

What cooling does the new architecture use?

The orthogonal chassis design offers 100–400kW liquid cooling support. Arista describes the racks as liquid-cooled and built for extreme density, power, and thermal demands.

ESUN stands for the Ethernet for Scale-up Networks initiative, which Arista says this effort leverages. It underpins Arista's open Ethernet approach to scale-up domains.

Open-Source AITop Companies' AI MovesAI Business & IndustryTop Companies AI10m agoOct 12, 2026, 06:30 JST

Arista Networks unveils open Ethernet rack for 144 accelerators

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3 Key Points

What happened
Arista Networks announced an open Ethernet rack-scale portfolio, engineered with AMD, Arm, Broadcom, d-Matrix, Meta, Microsoft, and Qualcomm, supporting up to 144 accelerators per rack and more via cross-rack setups.
Why it matters
It pitches an open, standards-based alternative to proprietary compute islands, letting cloud operators scale AI infrastructure with their preferred architecture and, per Arista, optimize token economics without lock-in.

WHO IT HITSCloud titan operators and enterprise AI infrastructure teams designing high-density AI clusters gain a standards-based Ethernet option, with Arista and its compute partners positioning it as an alternative to proprietary interconnects.

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Context & Analysis

The announcement positions Arista's Ethernet-based rack designs against the PCIe and proprietary interconnects that have constrained tightly coupled communication across large accelerator pools as AI models expand. By partnering with AMD, Arm, Broadcom, d-Matrix, Meta, Microsoft, and Qualcomm, Arista is aligning its hardware with a broad set of compute vendors rather than a single chip ecosystem.

The portfolio spans several physical form factors — an orthogonal chassis for single-rack density and a cabled backplane for serviceability — giving operators options depending on accelerator and workload needs. Arista frames the open, standards-based approach as a way for cloud titans to scale heterogeneous compute without proprietary lock-in.

FAQ

How many accelerators can Arista's rack-scale architecture support?: Arista says the designs support up to 144 accelerators per rack. Its Etherlink SU-144 scales to 1,024 XPUs through cross-rack topologies.
What cooling does the new architecture use?: The orthogonal chassis design offers 100–400kW liquid cooling support. Arista describes the racks as liquid-cooled and built for extreme density, power, and thermal demands.
What is ESUN?: ESUN stands for the Ethernet for Scale-up Networks initiative, which Arista says this effort leverages. It underpins Arista's open Ethernet approach to scale-up domains.

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