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Hello @jexkin and welcome back to Gridcoin! Watercooling should be considered for multi-GPU rigs (can be very difficult to aircool, unless you intend to build a mining rack in your basement).

Watercooling is also useful if your mining rig is going to be placed in the living room or anywhere else where constant noise might be an issue (water will practically reduce operating noise to zero, while allowing massive overclocks).