Oh, that's better, it's a good cooler.
As you can see I have almost same setup.
If you would download and install
http://www.techspot.com/downloads/4645-amd-overdrive.html to follow temperatures and other parameters as it is most accurate with AMD platform and also has logging for data and stability tests.
I suppose that you are familiar with BIOS, if not brake out the manual.
First thing would be to turn off all power saving and turbo options in BIOS so as not to interfere, may be able to turn some back on after.
Next would be to use manual settings for voltage and speeds but leave them at the default values.
Now you can start raising CPU multiplier a notch at the time, running stability test and keeping an eye on temperatures and voltages and enable logging so you can see what was happening at every step.
Once you run into instability you can raise CPU voltage a notch, rinse and repeat.
Make sure you have clear access to CMOS reset points as you are going to need them several times if OC goes wrong (and it probably will).
Most important thing, arm yourself with patience, lot's of it. (Coffee and scotch helps).
How far you can get with OC, nobody can tell you as no 2 processors or even 2 whole systems are not exactly same.
My guess is that you should not have problems until 4.6 - 4.7 GHz.