Shell
Same box — liquid: 576 GPUs · 1,088 kW · PUE 1.2 · air (this figure): 128 GPUs · 232 kW · PUE 1.45
The same 40 ft shell as the liquid-cooled module (Fig 7), re-planned around air. Four racks of four DGX B300-class nodes give 128 GPUs and 232 kW of IT — a quarter of the liquid box — because air sets the ceiling twice over: each rack stops at 58 kW, and three CRAH cabinets along the front wall take the floor the other four racks would have used. Cold air leaves the CRAH faces, crosses the rack fronts and returns hot over the contained aisle behind the racks. There is no CDU, no manifold and no pipework inside: the only water in the building is chilled water sealed inside the CRAH coils, fed from the single chiller outside the end wall. Every number comes from one model object, driven by the load slider.