NVIDIA’s New AI Servers Run on Hotub Coolant and Don’t Need Evaporators

- NVIDIA’s Ruben architecture is rewriting the thermal playbook for AI factories. By ditching evaporative chillers for closed-loop hot water cooling, they’re saving millions in power bills while sparing freshwater reserves. The secret? Keeping coolant at a toasty 45°C, allowing dry radiators to handle the heat rejection without water loss. It’s efficient, scalable, and utterly devoid of RGB lighting—though I’d swap that node in twelve minutes if given the chance. This isn’t just about sustainability; it’s about slashing operational costs for hyperscalers. As we push toward fully automated data centers, this physical layer optimization is crucial. Whoa, that's mega-illegal... in terms of how much money it saves. The future of AI infrastructure is hot, dry, and incredibly profitable.