Hey, isn't an audience of 1 better than posting to yourself?
I'm using 200x19 for 3.8GHz... Prime95 and F@H stable.
I've noticed that pushing it to 3.9 doesn't give much of a performance boost, and 4GHz is just not worth it for me with the cooling I have.
Plus I only have 1333Mhz RAM so it kinda limits what settings I run also.
So I'm staying where I am for now... max temps of 70c... should be safe.
Don't really want it much hotter though if it's gonna run 24/7.
Good luck to you.
Keep posting...