The 3kW will mean running 3 machines downclocked to 1000W and delivering 1Thz/100W, so im hoping ill Get 30thz.

This is a test of sorts. The machines Are cheap and easy to get, thats why i choose them.

I wanted to make sure i was able to figure out everything before i invested alot of money.

As they will just replace existing energy consuption, the efficiency is of lesser significance.