Nvidia DSX Runs Coolant at 45°C to Cut AI Data Center Water Use to Nearly Zero

For AI engineers and infrastructure teams, cooling is becoming a hard constraint on scaling. Nvidia's DSX system changes the thermal equation by letting coolant enter servers at 45°C—13°C warmer than the 2024 industry average—so AI clusters can shed heat with simple fans instead of chilled water. That could unlock larger training deployments in water-constrained regions, but the energy penalty deserves close scrutiny.

As pressure mounts over the water appetite of AI data centers, tech giants are signaling that the cooling problem is solvable. Nvidia claims in a June report that its DSX design and management system can nearly eliminate water consumption at some facilities. This comes amid public anger in the United States over data centers' demand for water and power. Rystad Energy reports data centers consumed 222 billion liters (59 billion gallons) for cooling in 2025; without adaptive measures that could nearly triple to 644 billion liters by 2030, though targeted steps could keep growth under a doubling.

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Nvidia's design allows coolant to enter at 45°C, much warmer than the 32°C average Uptime Institute observed for closed-loop systems in 2024.

The technique behind Nvidia's claim is a closed-loop liquid cooling system that circulates coolant directly through servers as close as possible to chips. Chips can run above 80°C (176°F). Nvidia's design allows coolant to enter at 45°C, much warmer than the 32°C average Uptime Institute observed for closed-loop systems in 2024. Because the liquid is already warm, facilities do not need to chill it aggressively; Nvidia's Josh Parker says simple fans circulating air are often enough, though some deployments require a mix of methods.

This is a significant engineering shift, but it exposes a fundamental tension: water and energy are not independent cooling inputs. Andy Masley, an independent researcher covering AI and data centers, notes a direct trade-off: cutting water use usually increases electricity demand because the sealed coolant must still be cooled, often using air blown over it. Thus a data center may reduce water withdrawals while raising power consumption, a dynamic that matters for grids already strained by AI expansion. In this sense, DSX does not eliminate environmental impact so much as relocate it from water to electricity, although the source does not quantify the energy penalty.

Market implications are substantial. Nvidia frames DSX not merely as server hardware but as a system for designing and managing AI data centers, which could deepen its control over the AI infrastructure stack. Hyperscalers and colocation operators facing local water permits, drought restrictions, and community opposition may adopt the technology to clear regulatory and reputational hurdles. If Nvidia's claims hold in real-world deployments, it could set a new baseline for sustainable AI infrastructure, pressuring rivals in liquid cooling and data center design to match 45°C coolant temperatures.

There is reason for caution. Nvidia's near-zero water claim is qualified: it applies to "some facilities" and depends on climate, electricity access, and workload patterns. The Uptime Institute's 2024 baseline is only a reference point, and no independent third-party validation is cited in the AP report. The industry is under mounting pressure to make good on such claims, reflecting skepticism after years of bold sustainability pledges. Moreover, the water-energy trade-off means regulators and environmental groups may demand disclosure of total resource intensity, not just water data.

The public anger referenced points to specific US communities where data centers are sited near residential water supplies. Although the AP report does not detail local cases, it notes the industry is spending billions of dollars, and that spending is now tied not only to compute capacity but to social license to operate. Data centers are increasingly built in water-stressed regions because land and power are cheap, which amplifies conflict. A technology that reduces water withdrawals can ease permitting and legal challenges, even if it raises electricity load. Therefore the water claim has both engineering and political value.