i beleive, this off the top of my head it 2:1 (it could be 3:1 or 1.5:1) and e6300 is 2 cores. since the architure is less, you double the computation. a core2duo makes 2-3 calculations, compared to 1 with p4.
Yeah, the E6300 is a much better cpu then any of the P4's or P-D's in every way. There faster, run cooler, more power efficient. Every other intel cpu is basically obsolete when compared to the conroes and woodcrests.
To be brutally Honest, The Clock speed for Pentium to be compared to a E6300's Equivalent performance would be about 4.4Ghz to 4.8Ghz Pentium
Or a AMD X2 4400- 4800 range.
its not that p4 is bad designed - it did not scale. it was designed for 10ghz. but after 4.3ghz or so the electrons leak through the side walls of the wires the side walls being like insulation on a wire. As the electons leak the system must push more off them - the ones that leak turn into heat. When net-burst was concieved they did not chips even remotely that fast, the leakage issue could not be tested.
C2D handles operations much more efficiently. It's all about the architecture. This article is everything you need to know(way more than you need really).