What Is GB300 NVL72?_
GB300 NVL72 is NVIDIA's rack-scale platform that integrates 72 Blackwell Ultra (B300) GPUs and 36 Grace CPUs into a single liquid-cooled rack connected by NVLink. It is the successor to GB200 NVL72, drawing roughly 120 kW per rack and requiring 100% direct liquid cooling, with the same overall mechanical and electrical envelope as the GB200 generation.
Technical Details
The GB300 NVL72 keeps the NVL72 architecture: GPUs and CPUs are joined into a unified rack-scale system over fifth-generation NVLink, with NVSwitch silicon providing all-to-all GPU connectivity inside the rack rather than external NVLink cabling. External connectivity to leaf and spine switches still uses dense 400G/800G InfiniBand or Ethernet, with 200+ fiber connections per rack. The rack weighs well over a metric ton and requires verified floor loading. Cooling is mandatory direct liquid cooling through cold plates, manifolds, quick-disconnect fittings, and a coolant distribution unit that transfers heat to the facility water loop. Power delivery uses high-amperage three-phase distribution sized for the roughly 120 kW per-rack load. Compared with GB200 NVL72, the GB300 generation increases HBM3e memory and throughput while preserving the deployment-facing infrastructure requirements.
How Leviathan Systems Works with GB300 NVL72
Leviathan Systems has direct deployment experience with GB300 NVL72 systems, covering site preparation, rack positioning, liquid cooling integration, network cabling, and full commissioning.
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