Downgrade to the May 3rd, 2017 Fixed Frequency 650 firmware.
Use the Advanced.cgi link to set your frequency (I found 750 maxed out my APW3++ PSU)
Upgrade to the October 22nd , 2018 firmware.
My power usage still remained a bit below what it was. Antminer was producing 14,764 GH/Sec. Of course, that is less efficient than if you did not overclock it.
I've heard there are additional settings that need to be tweaked via SSH in order to get it to actually perform at clock speed.
![](https://ip.bitcointalk.org/?u=https%3A%2F%2Fmedia.discordapp.net%2Fattachments%2F457139201092091919%2F504024787841056769%2Funknown.png&t=670&c=zOBxUGTjmUOz0Q)