first of all, overclocking is hit or miss so you might just have a chip that doesn't want to be overclocked. that being said, i would think you could get more. is it safe to assume you adjusted the core voltage along with the multiplier? also, chech the way you connected the L1 bridges. if you used a pencil, you might have to redo the lines. i have the same board and have my 900@100 at default voltage.