user27055: I have an Antminer u3 running on a raspberry pi using bfgminer. Its currently running at 47GH/s. Does anyone know if  is possible to over clock it using BGFminer so that it will run at 55 - 60 GH/s?
if i cant do it using BFGminer is there another mining software i can do it in?
any suggestions would be welcome and would be appreciated:)

user27074: I have 2 u3 antminers running on a raspberry pi b+ 
I could not get my u3 any faster until i used minera software,set to cgminer (offical)
with command: --au3-volt 830  --au3-freq 250.0    In the settings menu
 it will run at 62-63 GH/s.
you can download it hear  http://getminera.com/

user26793: I set up my rasp pi b+ and U3 mining rig using the instructions in this forum post, with screen and cgminer.
The command relevant to over clocking the raspi that I used is the following:
sudo ./cgminer --bmsc-options 115200:0.57 -o POOL -u USERNAME -p PASSWORD --bmsc-voltage 0800 --bmsc-freq 1286

Those last two options (bmsc-voltage and bmsc-freq) are what over clocked the rasp pi.  But I think I had to compile cgminer and configure it to include bmsc.  Mine typically runs with a hash rate in the high 50's or low 60's, but maybe not quite 62-63 GH/s.
Also, I did try to push the U3 voltage and frequency higher by playing with the settings as detailed in the U3 manual.  However, I could never get the U3 to run stably at settings any higher than what I gave above.  I'm not sure if it makes a difference, but I'm actually running two U3's on the one rasp pi and cgminer instance.
Update: In the interest of providing a complete answer in one place, here's the full text from the linked forum post:

Run a fresh install of Raspbian using NOOBS, after the install type ifconfig and make a note of the IP address, so that you can remotely
  SSH into your Pi. Login via PuTTY with the default username/password,
  then raspi-config if you would like to change the hostname, default
  password and so on.
Now update the Pi: 
  sudo apt-get update && sudo apt-get upgrade
Install dependencies: 
sudo apt-get install libusb-1.0-0-dev libusb-1.0-0 libcurl4-openssl-dev libncurses5-dev libudev-dev screen libtool automake pkg-config libjansson-dev screen
Clone cgminer from here: 
  git clone https://github.com/bitmaintech/cgminer
Install, configure and also enable bmsc options: 
cd cgminer
sudo ./autogen.sh 
export LIBCURL_CFLAGS=’-I/usr/include/curl’ 
sudo ./configure --enable-bmsc
sudo make
Test cgminer is working correctly by running the following (input your
  own pool, username and password): 
sudo ./cgminer --bmsc-options 115200:0.57 -o POOL -u USERNAME -p PASSWORD --bmsc-voltage 0800 --bmsc-freq 1286
Type Q to exit cgminer...
Now, add cgminer to start automatically when the Pi is powered on and
  create a screen session:
sudo nano /etc/rc.local
Remember, Ctrl-X to exit, then type Y and press Enter to save changes. Add this just above
  exit 0, again enter your own pool, username and password: 
cd /home/pi/cgminer
screen -dmS cgminer ./cgminer --bmsc-options 115200:0.57 -o POOL -u USERNAME -p PASSWORD --bmsc-voltage 0800 --bmsc-freq 1286


27055: <p>I have an Antminer u3 running on a raspberry pi using bfgminer. Its currently running at 47GH/s. Does anyone know if  is possible to over clock it using BGFminer so that it will run at 55 - 60 GH/s?</p>

<p>if i cant do it using BFGminer is there another mining software i can do it in?</p>

<p>any suggestions would be welcome and would be appreciated:)</p>
 27074: <p>I have 2 u3 antminers running on a raspberry pi b+ 
I could not get my u3 any faster until i used minera software,set to cgminer (offical)
with command: <code>--au3-volt 830  --au3-freq 250.0</code>    In the settings menu
 it will run at 62-63 GH/s.
you can download it hear  <a href="http://getminera.com/" rel="nofollow">http://getminera.com/</a></p>
 26793: <p>I set up my rasp pi b+ and U3 mining rig using the <a href="https://www.raspberrypi.org/forums/viewtopic.php?t=103046&amp;p=727350" rel="noreferrer">instructions in this forum post</a>, with screen and cgminer.</p>

<p>The command relevant to over clocking the raspi that I used is the following:</p>

<pre><code>sudo ./cgminer --bmsc-options 115200:0.57 -o POOL -u USERNAME -p PASSWORD --bmsc-voltage 0800 --bmsc-freq 1286
</code></pre>

<p>Those last two options (bmsc-voltage and bmsc-freq) are what over clocked the rasp pi.  But I think I had to compile cgminer and configure it to include bmsc.  Mine typically runs with a hash rate in the high 50's or low 60's, but maybe not quite 62-63 GH/s.</p>

<p>Also, I did try to push the U3 voltage and frequency higher by playing with the settings as <a href="https://www.bitmaintech.com/files/download/AntMiner-U3%20user%20guide.pdf" rel="noreferrer">detailed in the U3 manual</a>.  However, I could never get the U3 to run stably at settings any higher than what I gave above.  I'm not sure if it makes a difference, but I'm actually running two U3's on the one rasp pi and cgminer instance.</p>

<p>Update: In the interest of providing a complete answer in one place, here's the full text from the linked forum post:</p>

<blockquote>
  <p>Run a fresh install of Raspbian using NOOBS, after the install type <code>ifconfig</code> and make a note of the IP address, so that you can remotely
  SSH into your Pi. Login via PuTTY with the default username/password,
  then raspi-config if you would like to change the hostname, default
  password and so on.</p>
  
  <p>Now update the Pi: 
  <code>sudo apt-get update &amp;&amp; sudo apt-get upgrade</code></p>
  
  <p>Install dependencies: </p>
  
  <p><code>sudo apt-get install libusb-1.0-0-dev libusb-1.0-0 libcurl4-openssl-dev libncurses5-dev libudev-dev screen libtool automake pkg-config libjansson-dev screen</code></p>
  
  <p>Clone cgminer from here: 
  <code>git clone https://github.com/bitmaintech/cgminer</code></p>
  
  <p>Install, configure and also enable bmsc options: </p>
  
  <p><code>cd cgminer</code></p>
  
  <p><code>sudo ./autogen.sh</code> </p>
  
  <p><code>export LIBCURL_CFLAGS=’-I/usr/include/curl’</code> </p>
  
  <p><code>sudo ./configure --enable-bmsc</code></p>
  
  <p><code>sudo make</code></p>
  
  <p>Test cgminer is working correctly by running the following (input your
  own pool, username and password): </p>
  
  <p><code>sudo ./cgminer --bmsc-options 115200:0.57 -o POOL -u USERNAME -p PASSWORD --bmsc-voltage 0800 --bmsc-freq 1286</code></p>
  
  <p>Type Q to exit cgminer...</p>
  
  <p>Now, add cgminer to start automatically when the Pi is powered on and
  create a screen session:</p>
  
  <p><code>sudo nano /etc/rc.local</code></p>
  
  <p>Remember, Ctrl-X to exit, then type Y and press Enter to save changes. Add this just above
  exit 0, again enter your own pool, username and password: </p>
  
  <p><code>cd /home/pi/cgminer</code></p>
  
  <p><code>screen -dmS cgminer ./cgminer --bmsc-options 115200:0.57 -o POOL -u USERNAME -p PASSWORD --bmsc-voltage 0800 --bmsc-freq 1286</code></p>
</blockquote>
