I have two Antminer S3 that are both hashing at 440GBs. They both are running at the stock frequency of 218.75 but one if the miners has 20% HW errors. I have read many people are lowering the frequency to 215 or 212.75 to lower power consumption. I was hoping maybe reducing the frequency might help my HW errors. However I cannot find where to lower the frequency. I have done scrypt mining, but this is my first sha256 mining. If someone could help explain to me how to lower the frequency I would greatly appreciate it.