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A 30 kW rack used to get attention. In many AI HPC data centers, that number now looks conservative. Training clusters, GPU-heavy inference nodes, and tightly packed high-performance compute environments can push rack densities into a range where old comfort-zone cooling assumptions fail fast. When heat spikes, uptime, hardware life, and power efficiency all start moving in the wrong direction. For operators, engineers, and design teams, the real question is not whether these facilities need mor …