AWS Trn2 UltraServer
64 Trainium2 chips fused by NeuronLink — the block Rainier is built from.
You're looking at a system record: an assembled machine — a server or a whole rack — with what's inside it and where it's deployed.
AWS's UltraServer joins four Trn2 instances (64 chips) into one NeuronLink domain: 6 TB of HBM and 83 PFLOPS of dense FP8 per unit. Project Rainier stacks thousands of them with EFA networking — Amazon's rack-scale answer assembled from cloud primitives rather than a monolithic rack product.
Specifications & key facts
Each figure is labeled by basis: vendor spec, vendor claim, reported, estimate, or official. "Not publicly disclosed" means exactly that — we never invent values.
Overview
Memory
Compute
How this connects to the rest of the stack
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Contains
Deployed at
Sources
Record reviewed as of 2026-01-15 — see Methodology.