What Is Blackwell Ultra (B300)?_
Blackwell Ultra (B300) is the GPU at the center of NVIDIA's GB300 NVL72 platform, an evolution of the Blackwell architecture that pairs the GPU with the Grace CPU over NVLink-C2C. B300 increases memory capacity and bandwidth over the original GB200 generation while keeping the same NVL72 rack form factor, so deployments that prepared for GB200 carry forward the same liquid cooling, power, and network assumptions.
Technical Details
Blackwell Ultra builds on the dual-die Blackwell GPU design, connected to a Grace CPU through NVLink-C2C to form a Grace Blackwell superchip. In the GB300 NVL72 configuration, 72 B300 GPUs and 36 Grace CPUs are integrated into one liquid-cooled rack connected by fifth-generation NVLink and NVSwitch, the same rack-scale topology used by GB200 NVL72. The headline change versus GB200 is expanded HBM3e capacity and higher sustained throughput for large-model inference and training, which raises per-rack power into the same approximately 120 kW class that mandates 100% direct liquid cooling. Because the mechanical, electrical, and network envelope of the NVL72 rack is largely preserved, the infrastructure work — floor loading, CDU and manifold integration, busway capacity, and fiber counts — is consistent with GB200 deployments.
How Leviathan Systems Works with Blackwell Ultra (B300)
Leviathan Systems deploys GB300 NVL72 systems built on Blackwell Ultra, handling site preparation, rack positioning, liquid cooling integration, network cabling, and commissioning for the platform.
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