Data center professionals express skepticism toward Nvidia's claimed 54 million litre daily water savings for the DSX dry cooler architecture, arguing it overlooks mechanical cooling and indirect...

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    "summary": "Data center professionals express skepticism toward Nvidia's claimed 54 million litre daily water savings for the DSX dry cooler architecture, arguing it overlooks mechanical cooling and indirect power plant water usage.",
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        "url": "https://www.reddit.com/r/datacenter/comments/1xdb1wl/comment/19rj5bwd28n9f/",
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        "score": 22,
        "author": "Zealousideal_Bad2021",
        "excerpt": "No one uses cooling towers anymore. They are all closed loop systems. If data centers used water at the rate people think they do loudon county would be dryer than the Sahara",
        "posted_at": "2026-10-23T11:43:13.000Z",
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        "author": "SarcasticMohammad6",
        "excerpt": "they moved the water use from the data center to the power plant, that's all. the marketing team just drew the box where it looks best\n\n where I live it hits 40C in summer easy, dry coolers become useless without the mechanical assist they mention in fine print. curious what the actual annual hours of mechanical cooling would be in a place like phoenix, bet it's more than people assume\n\n the grid",
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        "author": "Consistent-Custard41",
        "excerpt": "The Ole flop between PUE vs WUE. Can't really improve one without making the other worse.",
        "posted_at": "2026-10-24T16:47:54.000Z",
        "author_url": "https://www.reddit.com/user/Consistent-Custard41/"
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        "author": "UnlikelyChart7283",
        "excerpt": "54 million liters a day…that’s a lot of water. How many do they use in a day?",
        "posted_at": "2026-10-23T11:28:30.000Z",
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        "author": "Maleficent-Sinking",
        "excerpt": "That Phoenix and Chennai breakdown is exactly what marketing teams try to avoid sharing.",
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    "evidence": [
      "[post] dry coolers reject heat worse when it's hot outside. nvidia itself notes some climates need additional mechanical cooling during extreme heat. that's more electricity on exactly the days the grid is tight.",
      "[comment u/SarcasticMohammad6] they moved the water use from the data center to the power plant, that's all. the marketing team just drew the box where it looks best"
    ],
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    "post_date": "2026-10-23T11:08:20.000Z",
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    "post_text": "saw the DCD writeup from GTC Berlin this week. nvidia's DSX platform pairs closed-loop liquid cooling with outdoor dry coolers, and they claim that at 2 GW scale it saves 54 million litres of water a day compared with conventional cooling-tower systems. it's their figure, nothing independent yet.\n\nI don't doubt the direction. dry coolers don't evaporate water on site, so the on-site number drops to near zero. but in impact assessment work the first thing you ask is where the boundary is drawn, and this one is drawn at the fence.\n\ntwo things sit outside it:\n\n- dry coolers reject heat worse when it's hot outside. nvidia itself notes some climates need additional mechanical cooling during extreme heat. that's more electricity on exactly the days the grid is tight.- that electricity comes partly from thermal plants that evaporate water in their own cooling towers. so some of the saving moves from the site's water meter to someone else's.\n\nit probably still nets out positive in a lot of places, esp. on grids heavy in wind and solar. but for a hot, water-stressed site on a mostly thermal grid I'd want the hourly picture, not an annual headline.\n\nwhat I'd actually want from vendors is water per MWh counted at the grid boundary, plus annual hours on mechanical cooling for a named climate.. a phoenix or chennai number, not a generic one.\n\nfor anyone running dry-cooled liquid halls in...",
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    "subreddit": "datacenter",
    "post_title": "Nvidia claims dry coolers save 54 million litres of water a day at a 2 GW site. Shouldn't the comparison count the extra power on hot days?",
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