Overview
- Nvidia released its Rubin server and DSX reference design on Monday, June 22, saying the systems use 100 percent closed‑loop liquid cooling that can run coolant up to 45°C to reject heat without fans.
- The coolant is a factory‑filled mix of about 75 percent water and 25 percent propylene glycol that Nvidia says is recirculated for the life of the facility to eliminate evaporative on‑site water loss.
- Nvidia claims the approach can cut facility cooling water to near zero in favorable climates and reduce cooling energy costs at hyperscale with industry estimates showing about 4 percent energy savings per 1°C chiller lift.
- Independent reporters and experts accept the facility‑level gains but note the announcement does not address water used to generate electricity or to make chips and that warm‑liquid cooling is less effective in hot, humid regions.
- Wider adoption will take years because of retrofit costs, operational risks such as leaks, and site economics, and the announcement arrives as regulators, researchers and local governments press for clearer disclosures after recent industry water reports.