As others have said, it is specific to your CPU/Motherboard/Cooling combination. Now, what I mean by this, is that someone else could have an FX-8350 and the same Asus board as you, and see different results.
To get what you want out of this CPU requires some decent trail and error, however, 4.4GHz is a reasonably decent target to aim for as an initial overclock.
I wrote a a tutorial on overclock.net that walks you through how to do what you're asking, I have a simplified version linked here: http://systemtuner.weebly.com/how-to-overclock-an-amd-cpu.html I also have all the links to diagnostic and test tools on that site. Because you have a black edition CPU, I'd recommend checking out my memory controller tuning guide: http://systemtuner.weebly.com/how-to-tune-an-amd-cpu-for-performance.htm
It's important to note, that with AMD (unlike Intel) you actually get better performance clock for clock in games by increasing the speed of your memory controller and tightening your RAM timings as opposed to solely increasing your CPU clock. (usually) That's why I linked that second guide.
On my personal setup, I leave my 8350 at the stock 4.1GHz (at 1.27v) but I increased the speed of my NB to 2.6GHz. I find that using this setup, I have more than enough horsepower for everything, including gaming+streaming.
If you have more questions/run into problems, just reply to this post.