Can I change the motherboard in a Dell XPS 420?

I know that blocks the bios from Dell on their systems so that no one can overclock. Do I get around to I change the motherboard to be compatible with the processor, the memory type and speed as well. What do you think? ATTN: JOSH

Just a heads up. They do not want you to upgrade anything. There's a good chance that your CPU is soldiered in place. Just buy a new computer or build one. You will enter into a real mess trying to replace the mother board on a Dell.

My Gaming rig/ Setup