Results were at idle, taking the lowest C2D desktop and Athlon 64 results and the highest C2D mobile results.Each test system was equipped with a GeForce 7900 GTX graphics card, 2 GB of Corsair CAS-4 DDR2-800 memory, 2 x Western Digital Raptor 74 GB hard drives and a Sony DVD+/-RW drive, all connected through an Enermax Liberty 620W power supply. Idle levels were taken upon first booting up the system, sitting at the Windows desktop. Full load levels were taken during with two instances of Prime95 running. Power management (C1E/EIST) was disabled for these tests, for both the Core 2 Duo mobile and desktop platforms.
C2D Desktop at 1.86Ghz: 152W
Athlon64 at 2GHZ:159W
C2D mobile at 2.33GHZ: 101W
At full load, same method:
C2D Desktop at 1.86Ghz: 176W
Athlon64 at 2GHZ:210W
C2D mobile at 2.33GHZ: 141W
EDIT: The advantage over Core Duo seems to be 10% average preformance boost, at 10% higher power draw.