The Samsung process isn't built for high clocks from what I hear, Intel will have the lead there for a while yet.
I also wouldn't call a 900mhz overclock shabby, remember this CPU (1700) is only meant to do 3.7GHz on 1 core, it's 3.0GHz base. There's a little more to come from it I'm sure, it reached 3.9GHz so easily and although I've been overclocking for many years I'm not very good (I don't have the patience).