580/8 hynix memory. 1.6.7- 1100+h/s but 1.7.0- 1050 h/s haven. there is an opinion that the miner 1.7.0 does not see some parameters from the config. when changing aes, fragments and bralock, the speed does not change and parameters a,f are not change in the table at startup.
what is your clock speeds achieving those hash rates? And which straps are you using?