Is that on an unmodified 1.15x?
Yes. Only modification is a few VGA coolers stuck to the bottom of the board.
I'm running unmodified 1.15x with 0.92a @ 160,150,144 and getting 3hour avg of 206 with 0.18% stales on eligius.
What is your error rate? At those clock frequencies you should be getting 227MH/s. Also, 0.92b (aka 0.92 official) is preferred; 0.92a has a lot of problems.