OK I have managed to find a manual for this board.....
To help with your throttling make sure ....
OC Tweeker Screen .....
AMD Turbo Core Tehnology is Disabled, it should be as defaulted.
Advanced screen ...
Cool n Quiet, Enhanced Halt State(C1E), Core C6 State are Disabled.
CPU Thermal Throttle is like RGone has stated a throttle bassed on your CPU Overheating .... leave this at Auto
APM ... Advanced Power Managment. I couldn't find it in the manual but I will assume it is there somewhere. ... Disabled
and last make sure you go to contole pannel and ....
Go into the windows power management section and set the power mode to "performance".
Do these things and you will have your CPU running at full throttle unless it gets to the point of over heating.
We have not had allot of guys here using the asrock boards and the few that have lately have found that they tend to run hot needing a fan blowing across the VRM / Socket area to help with stability. I wish I could remember which thread it was in right now but I can't find it.
Something I have noticed in your captures you have been using 10 min ish prime runs to test stability. This is not near long enough. There was a time when it was recomended that you run for 2 hours between bios changes and 12+ hours to really test stability. Things have relaxed allot along these lines and we ask you run atleast 20min between changes and once we get up near your max about 2 hours. This allows HW moniter to really show what kind of temps you are running. 10 min or less will not.
Now that being said it is your machine and you can decide what you think is stable.