bfgminer.exe -o MY_POOL_URL:PORT -u MY_WORKER_NAME -p WORKER_PASSWORD -S antminer:all --set-device antminer:clock=x0781
For 1.6 GH/s, use 0781 (this is the default) For 1.8 GH/s, use 0881 For 2.0 GH/s, use 0981 For 2.2 GH/s, use 0A81