And desktop, not laptop [mobile].

The Dual Core is basically two P4's in one chip with all of the heat problems and minimal interface method between the 2 cores.

The Core 2 Duo is an entirely new CPU architecture, much lower power consumption, far better performance than P4's at lower clock speed.

The first version of the Core 2 Duo is based on the Conroe Core, The quad version is the Kentsfield core.

The mobile Core 2 Duo is the Merom, low power, lower performance but excellent for a laptop.

The Conroe core has left AMD in the dust .

Read in tomshardware and anandtech sites.