PCI-Express continues to be popular with
proponents of the legacy PCI bus and with Intel
orientated designers. While the PCI-Express is not fully
backward compatible with the early PCI variants or with
PCI-X, the protocol similarities are often sufficient to
peak the interest of developers. The Intel suite of
advanced processors utilizes the PCI-Express standard
for processor interconnection and for interfacing to
support circuitry end peripherals such as memory.