Has anyone come across any piece of information on whether we can upgrade the laptop centrino duo to the more latest core 2 duo and how easy/hard it is. I am using a HP nx 9420 with T2400(1.83).
NO you can't
core duo and core 2 duo hav different current and voltaghe requirements
the core 2's need a lower voltage (down 0.4 volts nearly), your chipset may not support it anyway
I think you need to do some research on your particular motherboard/chipset. Google search CPU compatibility list [your motherboard] and see what comes up. Otherwise its just a guess if it will work or not.
As long as the proc on your mobo is removable, the socket type is the same, and you are running a compatable chipset. You should not have any problem using it. Like one guy said earlier though. They may have different Vcore requirements so you may also need to make sure your BIOS supports volt modding so you can lower the Vcore if necessary. But as always, just be careful and do a lot of research on your mobo before you make any decisions and mess things up.