Project Rainier node architecture
Project Rainier is operated by AWS / Anthropic in United States. This profile covers Multi-site cluster · representative Trn2 instance.
Cluster interconnect: AWS Elastic Fabric Adapter (EFAv3) · 3.2 Tb/s per Trn2 instance. Topology: Not verified.
Trn2 instance · representative building block
- Node count
- Not verified
- CPU
- Host CPU model not verified · 192 vCPUs per instance
- CPUs per node
- Not verified
- Accelerator
- AWS Trainium2
- Physical accelerators per node
- 16
- Host / unified memory
- 2 TB host memory (instance specification)
- Accelerator memory
- 1.5 TB HBM3 across 16 chips
- Local accelerator links
- NeuronLink
- CPU-to-accelerator link
- Not verified
- Storage
- 4 × 1.92 TB NVMe (instance specification)
Scope and uncertainty
Multi-site compute cluster; no single city pin. A representative Trn2 instance has 16 Trainium2 chips; four instances form a 64-chip UltraServer. The reported approximately half-million-chip deployment is not converted into an exact node count. Trainium chips are AI accelerators, not GPUs.
Not verified means a detail has not been confirmed in this catalog. Diagrams are schematic; node indices are illustrative, not physical hostnames. Data checked 14 September 2026.
Sources
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