Thought i would post this, since the bitmain chart with 25MHz steps keeps being posted instead, and for fine-tuning 25MHz is far to large of a jump in frequency. 218-243MHz is a good range to focus on, upping speed 6MHz at a time, running for 3-6hrs to check for errors, then increasing again
generated a table to work with, based on the S1/S2 tables:
...package 'cgminer'
config 'asic-freq' 'default'
#option 'freq_value' '1486' #262.5M
#option 'chip_freq' '262.5'
#option 'timeout' '15'
#option 'freq_value' '1386' #250M
#option 'chip_freq' '250'
#option 'timeout' '16'
#option 'freq_value' '1306' #243.75M
#option 'chip_freq' '243.75'
#option 'timeout' '17'
#option 'freq_value' '1286' #237.5M
#option 'chip_freq' '237.5'
#option 'timeout' '17'
#option 'freq_value' '1206' #231.25M
#option 'chip_freq' '231.5'
#option 'timeout' '18'
#option 'freq_value' '1185' #225M
#option 'chip_freq' '225'
#option 'timeout' '18'
option 'freq_value' '1106' #218.75M
option 'chip_freq' '218.75'
option 'timeout' '18'
#option 'freq_value' '1086' #212.5M
#option 'chip_freq' '212.5'
#option 'timeout' '18'
#option 'freq_value' '0782' #200M
#option 'chip_freq' '200'
#option 'timeout' '20'