New ASIC Bitmain Antminer Z9 shipped with firmware without overclocking equipment. Thus, the experience of a younger model Z9 Mini devices are well dispersed and allow you to obtain a noticeable performance increase. That’s why Bitmain has blocked the acceleration in the firmware of new parties Mini Z9 and Z9.
However, there are ways around such blocking. Originally modified the firmware overclocked sold user efudd on the forum Bitcointalk, and now, thanks to the user under the name smartass111, there are free version of this firmware.
Model Antminer Z9 more restricted voltage regulation chips, so overclocking results worse than the Z9 Mini. However, users without any problems achieve 20% gain in performance when the frequency of the chips in the 625-650 MHz, compared to the stock frequency of 500 MHz. Depending on the device can be achieved and a larger increase of frequency, however, it is necessary to consider the temperature of the chips and measure energy consumption with a power supply.