Pentium Dual Core processors are simply outdated and underpowered when comparing with current Core 2 Duo processors. Buy a Core 2 Duo processor if u want to have a Dual Core processor in your PC. Core 2 Quad processors are simply two C2D processors pressed in a single die. It is not a native quad core design and thus it does not achieve the performance what a native quad core can. Nehalem is the code name of Intel's next native quad core processors and as of now, the engineering samples of the upcoming processors promise better performance than anything else.
