Why CPU not upgradable?

[buildingacomputer]

I am looking for a laptop and read here in this section that CPU's are not upgradable. Is it because they are soldered directly on the motherboard? Or Motherboard manufacturers don't upgrade bios? I have never owned a laptop before and tend to see laptop as a miniaturized desktop. Thanks.

 

[MDE]

Some laptop CPUs are upgradable, some aren't. It depends on the model.

 

[Threader]

Emachines M6805 and M6809 cpu's are upgradable.

lookie here

Emachines Rock!

 

[Dark54555]

from what i've seen, it's mostly ultraportables that have soldered on chips. Mid to full size laptops tend to be interchangable.

 

[thomsbrain]

Originally posted by: MDE
Some laptop CPUs are upgradable, some aren't. It depends on the model.