Any of the power saving metrics are good. But if you want to use the most simplest metrics then WUE is for you. It is a very simple metric which gives you the result of the ration of yearly water usage is being used for IT equipments. The CUE calculates from the carbon and the WUE calculates the ratio from water usage. It is basically the same metric but using different element to calculate the power ratio. Zero is counted as the ideal value for WUE.
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