You need to replace the mainboard, of course and will also need to replace the heatsink assembly (the one for the Intel GPU you have won't fit the nVidia board) and if you now have a 65W or lower capacity adapter, you will need to replace the AC adapter with one having a rating of 90W or more.  
Hi, so i want a little upgrade im my laptop Dell e7540, i know i cant replace CPU and GPU in my laptop, so i need to change motherboard, i find a motherboard(KVR03) but its i7-5600u with NVIDIA N15S-GT-S-A2, i want to know how to swap it with my previous motherboard with i5-5300u and Intel Graphic Card, so my question is what i need to buy and replace to swap it successfully.
Motherboard swap from i5 Intel to i7 nvidia