#option 'freq_value' '0f82' #400M
#option 'chip_freq' '400'
#option 'timeout' '10'
#option 'freq_value' '0e82' #375M
#option 'chip_freq' '375'
#option 'timeout' '10'
#option 'freq_value' '0d82' #350M
#option 'chip_freq' '350'
#option 'timeout' '11'
#option 'freq_value' '0c82' #325M
#option 'chip_freq' '325'
#option 'timeout' '12'
#option 'freq_value' '0b82' #300M
#option 'chip_freq' '300'
#option 'timeout' '13'
#option 'freq_value' '0a82' #275M
#option 'chip_freq' '275'
#option 'timeout' '14'
#option 'freq_value' '0982' #250M
#option 'chip_freq' '250'
#option 'timeout' '15'
just playing with oc'n my use s3.
On an s3 you'll be lucky to get it at the 243, you might go 225. You'll find a bunch of x's or -'s for your asic chips. I have a s3+ that doesn't like it past the 250. Also remember to adjust your voltage. If you play too much...the saying goes ya pay to play.
Good Luck and Happy Mining!!