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A single high-density HPC rack can reject more heat than an entire legacy server row. Once rack loads move beyond what room air can carry economically, closed-loop liquid cooling becomes a facility design issue, not just an IT hardware choice. This Closed Loop HPC Cooling Guide explains the engineering checkpoints that determine whether a system delivers stable compute performance or creates a new heat-rejection bottleneck. What closed-loop HPC cooling actually does A closed loop circulates trea …