--- title: Hotter Than a Hot Tub: The 45°C Breakthrough to Cool... description: NVIDIA's Rubin generation of AI servers introduces 100% liquid cooling with no fans anywhere in the system, using coolant that operates at up to 45°C — warmer... canonical: https://daily.dev/posts/hotter-than-a-hot-tub-the-45-c-breakthrough-to-cool-ai-s-biggest-machines-snar65xuo twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Hotter Than a Hot Tub: The 45°C Breakthrough to Cool AI’s Biggest Machines | daily.dev og:description: NVIDIA's Rubin generation of AI servers introduces 100% liquid cooling with no fans anywhere in the system, using coolant that operates at up to 45°C — warmer... og:url: https://daily.dev/posts/hotter-than-a-hot-tub-the-45-c-breakthrough-to-cool-ai-s-biggest-machines-snar65xuo og:image: https://api.daily.dev/og/posts/sNaR65XUO.png og:image:alt: Hotter Than a Hot Tub: The 45°C Breakthrough to Cool AI’s Biggest Machines og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Hotter Than a Hot Tub: The 45°C Breakthrough to Cool AI’s Biggest Machines **[NVIDIA](https://daily.dev/sources/nvidia)** · 7 min read · 0 upvotes · 0 comments ## Summary NVIDIA's Rubin generation of AI servers introduces 100% liquid cooling with no fans anywhere in the system, using coolant that operates at up to 45°C — warmer than a hot tub. This higher temperature threshold enables chiller-less operation using outdoor dry coolers in many climates, potentially eliminating water consumption entirely. A 50MW hyperscale facility can save over $4M annually in cooling costs. The closed-loop system uses a 75/25 water-propylene glycol mix flowing through cold plates directly on processors. Compared to hybrid liquid/air-cooled predecessors, the fully liquid-cooled design also increases rack density (a 6U system now fits in 2U), eliminates hot/cold aisle management, and reduces noise. The NVIDIA DSX reference design formalizes these practices for AI factory construction. ## Full article daily.dev links to this article rather than hosting it. 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