The processor does not physically fit on the socket, See pictures below for socket sizes:
Intel® HM87 Chipset
List of processors that might be compatible on your HM87 chipset: Intel® HM87 Chipset (Intel® DH82HM87 PCH) Specifications
Sorry to be such a pain but going off that list would the Intel® Core™ i7-4800MQ Processor fit? You said might so I want to be sure,
It might because the list I gave you is not final, processor compatibility depends on the board maker or computer manufacturer. In this case, you need to contact your computer manufacturer to get more information about supported processor for your computer model.