Sapphire 9100 & screen refresh

Question

Hi everyone. I've just bought this card and installed with Catalyst 3.2. It seems I'm not able to set screen refresh frequency more than 60hz at 1152x864 . I try to change the frequency on Control panel, but the screen remains at 60hz, even if control panel says 85hz. I have a Smile CA6738SL monitor. With my previous card (Matrox G400) I was able to set refresh rate up to 85hz at 1152x864. What's happening? Is there a way to get rid of this? Tanks in advance.