2- Overclocking your miners doesn't always lead to more profit, in most cases, it reduces the efficiency of the miner and increases your power bill.
If you have a s17 pro with correct aftermarket firmware it can do 980 watts and 39.6 th
I purchased a unit with the firmware to test the most efficient setting. Just about 25 watts a th.
The unit is quiet and runs cool.
So 10 units would do 396 th and 9800 watts.
If you overclock the same unit with stock bitmain firmware it does 58th and 2700 watts which is 46.5 watts a th.
or 580th and 27000 watts.
So rather than spending the money on cooling
Buy more s17 pros and underclock
27000 watts divide by 980 = 27 s17 pros
27 set to 39.6 = 1069 th
So while super cooling look cool it is costly.
The nice thing of having 27 units set to 39.6 th.
vs 10 units set to 58th is you can crank gear up a little if coins go high.
So my advice is extra units down clocked is better than super cooled gear.