Upgraded my i5 ThinkPad X220 with an i7 motherboard bought on eBay. Think I figured out why ethernet is the only thing that doesn't work : r/techsupportgore
asus motherboard cpu combo i9 | eBay
ASUS PRIME Z270-A LGA 1151 DDR4 ATX, Intel Motherboard for sale online | eBay
Intel DZ68BC Motherboard and Core I7 CPU Combo for sale online | eBay