What is the actual make/model of your motherboard? With that info, you can go to the manufacturer's support website and determine the compatible CPUs for your motherboard (and if a BIOS update is required for a newer CPU).
No, it wont fit. That Xeon is 2011-3 not 2011 so it wont work in a x79 board but may work in a x99 board(would need to check the manufacture site for supported cpus).