The Raspberry Pi 5 uses PCIe for the backbone between the SOC and their RP1 chip. Four lanes of PCIe, to be exact, providing a 16 Gb/s link between the body and the brains. This is interesting ...
Like the Raspberry Pi 5, the Compute Module 5 features a 2.4GHz quad-core Arm chip, 2 × USB 3.0 interfaces, Gigabit Ethernet, PCIe 2.0 x1 interface, 4K dual HDMI interface, and 30 GPIOs.