PUE or Power Usage Effectiveness and other similar metrics such as DCiE are used to evaluate how effective a data center works in terms of energy consumption. To have a lower PUE and better performance, more efficient cooling systems such as liquid immersion cooling can be a great solution.
The new machine will be named L7 and is intended primarily for the mining of Litecoin (LTC) and Dogecoin (DOGE). It also means that the ASIC will support all cryptocurrencies based on the Scrypt algorithm.