I just gotten the antminer S9 for Jan batch. The Asic# for one of the boards is lower than the rest, and the hashrate is lower too.
I'm using a third party PSU rated at 1900w with 220v, and I'm using 220v circuit at home.
Anything I can do besides sending it back? Chinese new year is coming, and by the time I got it back might be late February 

https://i.imgur.com/gbYzASj.jpg