I got a brand new graphics card for Christmas;

EVGa GeForce 660 Ti, 2GB DDR5 Memory, 192-bit memory width.

But I cant get above 90MH/s with it? Even overclocked, its sitting at 100MH/s. A friends GPU, that is 3 years old, is getting 200-400MH/s?

How do I tweek my settings to get the best results?

Any ideas?