The HP 18E7 is a proprietary micro-ATX (uATX) motherboard designed exclusively for HP All-in-One 24/27-inch series (e.g., 24-xa, 24-f, 27-xa). It is not a standard retail motherboard and uses custom power, I/O, and cooling connectors. It supports 7th and 8th generation Intel Core processors with LGA1151 socket.
This motherboard uses the LGA 1150 socket. It supports Intel "Haswell" processors. If you are looking to upgrade the CPU, these are the compatible lines: hp 18e7 motherboard specs top
Due to its proprietary nature, note the following: The HP 18E7 is a proprietary micro-ATX (uATX)