There are a lot of good reasons, 1)Laptop motherboards are purpose built. The only one that will fit in the rest of the laptop is the one that's in it now. 2)The processors are usually soldered into the board, you physically can't just yank it out without destroying the board. 3)There are no FM2(+) boards that will fit into your laptop. 4)laptops are designed to cool the chips that are in them, not desktop chips. So many good reasons, pick which ones you like. By buying a laptop you pretty much save yourself the trouble of replacing anything in your computer with a few exceptions, those being memory sometimes and HDD/SSD/ODD sometimes. Sometimes there's just nothing you can do.