AI racks are pushing in-rack CDUs toward twice the coolant flow at higher pressures, in the same footprint. This session is about the component that decides performance: the pump. Key takeaways: 1. Why efficiency and reliability are linked and not two opposing design considerations 2. How flow and pressure requirements evolve from Blackwell to Rubin 3. Where the pump's energy ends up, and how it influences thermal design of the TCS loop 4. What pump efficiency means for PUE, energy density, and token generation