Confirmed, using 375 MHz and 37 timeout is hashing at about 200 Ghash/s
option 'freq_value' '4e81' #375M
option 'chip_freq' '375'
option 'timeout' '37'
At 400 Mhz, I got way too many hardware errors, like 50%...so, I'm trying the 375 settings.
Dunno why that was so high errors, but I guess it's just the luck of the draw.