Looks like a good right. Check my rig configuration, believe me the mobo isn't your "problem", you are limited with the CPU, voltage and heat of it. The mobo can easy set the 6GHz, 7GHz or more without problems.
If you are trying to OC your CPU, you need 1st disable C1E, Cool'n'Quite and AMD Turbo Mode. As your CPU is lock multiplier you only can OC the CPU using the FSB and not the CPU multiplier. The HT link don't give you any performance above 2000MHz, that's the reason for the 2000MHz manually in the BIOS eve if the mobo support frequencies above the 2000MHz. Your are right, AMD support 1066MHz and 1333MHz but with OC you can run the RAM to a frequency above the stock 1066MHz or 1333MHz. Remember that if your RAM isn't rated to 1600Mhz and you want run it to that speed is on your own risk since that can kill the CPU's memory controller or the RAM too.