they have changed the PSU and replaced it with a 3600 W model. I think it can be overclocked.. umm.. not really overclocked but more fine tuned since on some machines there is a difference in frequency between boards.
SM0 638
SM2 682
the miner is totaling of 67.3T
probably it is possible to get better hashrate if setting by board frequency since the auto tuning on startup is not "fixed" by board, but the total average seems to be the same.
tried logging in with putty SSH like the S9, but it's not connecting.
Humm, you think they closed SSH like Bitmain does?
With fixed frequency for sure its possible to give some more TH, but you need to be carefull try to see how much is consuming now with 67.3 TH, do you have a Watt meter?