It is a nice contrast between this new modular design with integrated DLC coldplates and the 4u B300 design with a row o…

SemiAnalysis Twitter · SemiAnalysis (@SemiAnalysis_) · 2026-06-26

SemiAnalysis contrasts NVIDIA's new Rubin-generation modular HGX design featuring integrated direct liquid cooling coldplates with the older B300 design that relied on fans atop coldplates to cool system components.

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NVIDIA Expands Enterprise AI Ecosystem Across Cloud, Agents, and Industry Verticals

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Topics: nvidiagpu-hardwaredata-center-coolinghpc-infrastructure

Claims

NVIDIA's new Rubin-generation HGX design uses integrated DLC (direct liquid cooling) coldplates in a modular form factor.
The prior B300 design used a 4U chassis with fans moving air over coldplates to cool ancillary system components.
The architectural shift from fan-based to integrated liquid cooling represents a significant change in how system thermal management is handled.

Key quotes

It is a nice contrast between this new modular design with integrated DLC coldplates and the 4u B300 design with a row of fans moving air on top of the coldplates, just to cool all the other systems components.