FYI: with those 2x Z9 from batch2, i§m not able to go over 600MHz, when i overclock more, they runs just about 1.5 KSol.,.. Asic status is oooo for al boards
Doesnt matter if i set 610, 630, 650 or more, looks the same
Something as:
Chain# ASIC# Frequency KSol/S(RT) HW Temp(PCB) Temp(Chip) ASIC status
1 4 666 1.62 0 33 41 oooo
2 4 666 1.27 0 33 41 oooo
3 4 666 1.39 0 35 44 oooo
Compared to 600 MHz:
Chain# ASIC# Frequency KSol/S(RT) HW Temp(PCB) Temp(Chip) ASIC status
1 4 600 4.30 0 50 64 oooo
2 4 600 4.09 0 46 60 oooo
3 4 600 4.62 0 49 61 oooo
try 668 MHz instead of 666.
in may 26 firmware the stepping is as follow for ,... ,500, 600, 700 up to 750 MHz:
06
12
18
25
31
37
43
50
56
62
68
75
81
87
93
00
I guess Bitmain might have some reason for chosing that particular stepping.
good luck and please give feedback to us all !