The Pentium is dual core, has more cache and uses the 200/800 fsb.
On the other hand, it runs a lot hotter, so dont try using your celery hsf on it. Spend a few bucks to get a decent after market unit. The stock one, that came with the chip have a tendency to loosen off.
Make sure you have great case ventilation, and expect your room to get a few degrees warmer.