I have a dell latitude d400 with an Intel Pentium M Processor 1.40 GHz. Im wondering if i could upgrade that to an Intel Core Duo, please help. Thanks. I have xp running on this.:D
Sorry, but I don't recommend this. With a desktop system, then possibly. However, with laptops things are much more complicated. Power consumption and heat dissipation are the greatest concern and they are optimised for the current processor in the system. A replacement processor, if it is not identical, might have different power and thermal characteristics, in which case the system would fail to keep it within its normal working range. In addition to that, simply accessing the processor on a laptop is much more complicated than simply removing the side panel as you would on a desktop. You literally have to strip the laptop right down, being carefull not to lose the various small screws or damage the wiring and its connectors. And then, of course, you will need to repeat the procedure in reverse to reassemble it.
Personally, I would leave your laptop as it is, with one exception. To improve its performance, make sure that you have installed the maximum amount of memory that it supports (see manual for details).
4 x 4GB DDR3-1600 Corsair Vengeance CMZ8GX3M2A1600C9B (16GB)
Graphics card(s)
MSI GeForce GTX770 Gaming OC 2GB
Sound Card
Realtek High Definition on board solution (ALC 898)
Monitor(s) Displays
ViewSonic VA1912w Widescreen
Screen Resolution
1440x900
Hard Drives
OCZ Agility 3 120GB SATA III x2 (RAID 0)
Samsung HD501LJ 500GB SATA II x2
Hitachi HDS721010CLA332 1TB SATA II
Iomega 1.5TB Ext USB 2.0
WD 2.0TB Ext USB 3.0
I don't think the Core 2 would even be compatible with that laptop. It's an old laptop, so you'd most likely have to upgrade the whole thing as it uses DDR RAM, not DDR2.
Better not try to upgrade the processor, as taking the processor out if going to be a long & painful process. And if you break anything or damage any wiring then matter can get a bit out of hand.