Just wanted to chime in for anyone that wants an easier way to over clock the AntMiners and are not too familiar with PuTTY:
Use WinSCP. I've used it to overclock my AntMiners, it takes about 30 secs for the whole procedure, and it's all GUI, so no need to learn cmd.
1.) Download/Install/Open WinSCP
http://winscp.net/eng/download.php2.) Click on 'New Site' and change the protocol to "SCP" from the drop down menu
3.) Put in your miner information(IP address/username/password) and you will see all the folders and files in the miner.
4.) Navigate to .../etc/config/
5.) Open file called
asic-freq6.) Copy/paste the following:
package 'cgminer'
config 'asic-freq' 'default'
option 'freq_value' '4f81' #400M
option 'chip_freq' '400'
option 'timeout' '35'
#option 'freq_value' '4e81' #375M
#option 'chip_freq' '375'
#option 'timeout' '37'
#option 'freq_value' '4d81' #350M
#option 'chip_freq' '350'
#option 'timeout' '40'
#option 'freq_value' '4c81' #325M
#option 'chip_freq' '325'
#option 'timeout' '40'
#option 'freq_value' '0b81' #300M
#option 'chip_freq' '300'
#option 'timeout' '45'
#option 'freq_value' '0981' #250M
#option 'chip_freq' '250'
#option 'timeout' '55'
#option 'freq_value' '0781' #200M
#option 'chip_freq' '200'
#option 'timeout' '70'
#option 'freq_value' '4f02' #193M
#option 'chip_freq' '193'
#option 'timeout' '70'
7.) Save file and close. It'll take about another 5-10 seconds for WinSCP to upload the file automatically.
8.) Close WinSCP after uploading is complete, and restart miner.
I have my chip frequency set to 375Mhz instead of 400. I have too many things heating up the small room I have everything in, and 400Mhz makes everything so much hotter.
Original instruction set for overclock: https://bitcointalk.org/index.php?topic=348327.0