Rubin platform ships 100% liquid cooling at 45°C inlet for zero-water AI factories

NVIDIA's DSX design eliminates air cooling and evaporative towers for Rubin-generation clusters. Every GPU, CPU, and switch is cooled in a closed liquid loop. Dry coolers reject heat directly when ambient conditions allow, with chillers required less than 1% of annual hours in suitable climates. This removes the 40% of facility power historically spent on cooling and ends water evaporation losses.

Data from the reference architecture shows a 50 MW installation saves more than $4 million yearly in combined energy and water costs. Raising loop temperatures by one degree reduces chiller work approximately 4%. The 45°C specification enables chiller-less operation across wide geographic ranges, a threshold air cooling cannot reach at Rubin power densities.

Prior coverage focused on efficiency gains while omitting the hard infrastructure constraint: water availability now limits siting for clusters above 100 MW. The closed-loop design also reduces Scope 3 emissions tied to water treatment and transport. Operators must now re-rate PUE calculations and negotiate power-water contracts together.

Next deployments will standardize on dry-cooler retrofits for Blackwell-to-Rubin migrations. Facilities without access to dry-cooler real estate will face 15-20% higher TCO from retained chillers.