Another 77 inch wide rack is about to be setup inside here and the rigs on the 48 inch wide rack will be transferred over to it. The 48 inch can hold eight rigs. The 77 inch wide rack can hold 12 rigs at 3 rigs per shelf.
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That is a pretty sick mining room. I love the custom built mining rig cases. Seems like a good combination of wood and aluminum(?). Although some might say that all the wood is a big fire safety risk. You mind me asking what GPUs are you using? Seems like you've diversified into both AMD and NVIDIA.