600 MHz - 18.0 v -  0 of 44 chips detected on 2 boards, 1 board boots up.

600 MHz - 19.0 v -chain[0] - 14 of 44 chain[1] - 0 of 44 chips detected, 1 board boots up.

400 MHz - 19.0 v - 0 of 44 chips detected on 2 boards. 1 board boots up.

I am wondering if i should try what jbillke did by warming up the chips during booting process. Is it safe to try 73 TH/s with 825 ? Is it safe to enable quiet fan on startup?