After logging in via SSH the following steps:
1. type: "cd /etc/config"(without the quotes) and hit enter.
2. type: "vim asic-freq"(without the quotes) and hit enter.
3. hit I button to enable "edit mode" and adjust the settings, lines beginning with # are ignored.
4. after you're done hit the ESC button to exit "edit mode".
5. type ":wq" (without the quotes) to execute write and quit.
6. you'll be back in the command line, type reboot to restart your device.
You can check your frequency in the web interface miner status page.
If everything went ok, you're mining with higher speed
Then you can donate to me for providing you with extra steps to unleash ultimate hashing power
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Keep looking at your HW errors to make sure your device isn't frying up.
I've added some tiny heatsinks, and running 400Mhz but still 3.3% HW error.
But my Antminer is using the Corsair AX860 80+ Platinum PSU and @400Mhz it's sucking around 395W out of the wall-socket