Water is a slightly cheaper way to reject heat if you have unlimited almost free water. I don’t think you’d use water for cooling if you had to pay residential

Water is a slightly cheaper way to reject heat if you have unlimited almost free water. I don’t think you’d use water for cooling if you had to pay residential water rates instead of like agricultural rates for water. It’s not at all a showstopper to just dump the heat into the air without using an evaporative cooler. It just costs somewhat more. Compared to the capital cost of an NVidia GPU server, the cost is small.