Simple facts,
All
Core 2 Duo Processors are Dual Core Processors..
All
Pentium D Processors are Dual Core Processors..
All Intel
Dual Core Processors are Dual Core Processors...
Pentium D is nothing but 2 Prescott Processors side by side... runs very hot, not a good OverClocker...
Intel Core 2 Duo processors are next gen processors from Intel on 65 nm platform... developed from Ground up with new Architecture called
Core... so they are whole new Processors just Jump like Pentium 2 to Pentium 3 or Pemtium 4... Expect one Core 2 Duo Lowest End Processors like E4400/E4300 taking up and beating Intel Pentium D 3.8 GHz ones with ease
... runs damn coool and super overclocker...
Intel Dual Core Processors are just launched striped down version of Core 2 Duos.. there are 2 in Market for Desktop range, E2140 runs at 1.6 GHz with 1 MB L2 and 800 MHz FSB and E2160 with 1.8 GHz with same specs of E2140.... these are not Pentium D rather they are same btach like Core 2 DUo based on the new Core Technology.... they perform same like Core 2 Duos but they were launched with a very low price like Rs. 2800/- + TAX for E2140 to counter super low cost but high performer AMD X2 range....