Upgrade i5-2520M to a CPU of a 3 generation

[acosh]

I want to upgrade my i5-2520M (Dell E6420, QM67) to a CPU of 3 generation.

Which CPU are 100% compatible with my laptop, socket, mainboard?

Thanks ahead!

[AlHill]

No, you cannot upgrade in this manner.

You must contact Dell and ask which processors are compatible with their bios. The processor must be socket and BIOS compatible.

Doc

[acosh]

Found the answer - http://en.community.dell.com/support-forums/laptop/f/3518/t/19568237 Latitude E6420 i5-2520M QM67 BIOS A19 - possible replace by ivybridge processor - General Hardware - Laptop - Dell Commu…

NO, they are not compatible.

"Dell released the 6x30 series for Ivy Bridge support - different mainboard. You can use only Sandy Bridge CPUs."

Al, thanks for directing me in a right way.