Sounds like you have room to OC it a bit further. 3722MHz is 3.7Ghz (1000MHz to 1GHz). My experience with AMD Overdrive utility wasn't impressive. The program overclocked my CPU to run only 200MHz faster. I would say you can safely set your CPU multiplier up a notch, and then increase it in increments of half steps. I'm not very experienced with this, but when your CPU is running too hot or you can't boot anymore, put your CPU multiplier back on a stable setting.
You can further OC your CPU by giving it extra voltage, but you should read some of the guides online on how to do that with your board specifically. There are also a lot of guides online for your Black Edition processor, one is even stickied in this forum.