aicom :
Ivy Bridge will blow you away compared to a Core 2 Duo. I'd ballpark maybe a 35% improvement from the Core 2 Duo architecture assuming equal clock speed and core count. That said, you don't have the benefit of turbo boost on the Core 2, so there's a reasonable chance your laptop could be running at a higher frequency than your desktop (at least in bursts, if not all the time).
EDIT: The 3.0 GHz clock of the E8400 sits right around the middle of Sandy Bridge's turbo range so it's likely you'll see clock speeds in that area for many CPU intensive tasks.
EDIT: The 3.0 GHz clock of the E8400 sits right around the middle of Sandy Bridge's turbo range so it's likely you'll see clock speeds in that area for many CPU intensive tasks.
The speed.gain is well over 35%. The gain from ivy bridge is supposed to be 5-10% over sandy bridge and sandy bridge had a huge advantage over The first gens which the first gens had a big advantage over none core i series