You would need new board, and ram, for an i7 6700k, plus an aftermarket cooler. Not to mention a new windows license, if yours is an OEM key. If this is your board, then after bios update, you could go with an i7 3770, or a Xeon 1230v2. https://www.asus.com/Motherboards/P8H61M_LX_R20/HelpDesk_CPU/ You wouldn't have to worry about changing anything else.