NVIDIA Rubin Infrastructure & Deployment_
Rubin is the platform after Blackwell — pairing the new Rubin GPU with NVIDIA's Vera CPU, HBM4 memory, and NVLink 6. The teams already deploying Blackwell today are the ones who will deploy Rubin first. Leviathan is planning power, cooling, and fabric for Rubin now.
What Is NVIDIA Rubin?_
Rubin is NVIDIA's next data center GPU architecture, following Blackwell/Blackwell Ultra. The flagship rack system, Vera Rubin NVL144, combines Rubin GPUs with the custom Arm-based Vera CPU and moves to HBM4 memory and NVLink 6 — a large jump in interconnect bandwidth and per-rack compute.
It is followed by Rubin Ultra NVL576, which pushes toward ~600 kW racks. The practical implication for operators: power delivery (800V DC), liquid-cooling capacity, and back-end fabric all need to be planned a generation ahead. Retrofitting later is far costlier than designing for it now.
Rubin Platform Specifications_
Specifications below reflect NVIDIA's public roadmap disclosures and will be updated as final details are confirmed.
| Specification | NVIDIA Rubin |
|---|---|
| Platform | Vera Rubin — Rubin GPU + Vera CPU (custom Arm, ~88 cores) |
| Memory | HBM4 (next-gen high-bandwidth memory) |
| Rack System | Vera Rubin NVL144 — 144 GPU dies per rack |
| GPU Interconnect | NVLink 6 — ~3.6 TB/s per GPU |
| Networking | ConnectX-9 (1.6T) / Spectrum-X & Quantum-X next-gen |
| Cooling | Direct-to-chip liquid cooling (rack power rising sharply) |
| Successor | Rubin Ultra NVL576 (4-die packages, ~600 kW racks) |
| Availability | Expected 2H 2026 → 2027 (Rubin Ultra) |
Plan for Rubin Now_
Rubin-class racks push power well beyond today's 120 kW. New builds should plan 800V DC distribution and busway capacity ahead of delivery.
CDU capacity and facility water loops should be sized with headroom — Rubin Ultra trends toward ~600 kW racks. Under-provisioned cooling becomes a hard ceiling.
Back-end fabric moves to ConnectX-9 / next-gen Quantum-X & Spectrum-X. Cable plant and tray routing should anticipate higher-radix, higher-bandwidth topologies.
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