I have 4 motherboards mounted to a shelf in a closet. I have two 1000 watt power supplies(attached under the shelf) split between the four. Two power supplies was better, just to keep the overall hardware footprint smaller. The hard drive for each board is mounted to a drive stack, also attached under the shelf.
All boards are using Corsair h50 water coolers.
It looks ghetto, but it's a fast renderfarm.
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