All about QPI

[hatter]

Since the beginning of times Intel CPUs use an external bus called Front Side Bus or simply FSB that is shared between memory and I/O requests. The next generation of Intel CPUs will have an embedded memory controller and thus will provide two external busses: a memory bus for connecting the CPU to the memory and an I/O bus to connect the CPU to the external world. This bus is a new bus called QuickPath Interconnect (QPI) and in this tutorial we will be explaining how it works.

Everything You Need to Know About The QuickPath Interconnect (QPI) | Hardware Secrets