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The DeskPi Super6C is a standard size mini-ITX board that supports up to 6 CM4 modules, with an M.2 slot and microSD card slot available to each of the boards. It uses a 4-pin ATX CPU power plug, and has two RJ45 Gigabit Ethernet ports connected through an onboard 8-port Gigabit switch.
There’s a USB 2.0 hub and two HDMI ports connected to the first Pi, which is nice for cluster management / debugging purposes.
See the DeskPi Team’s technical documentation of the board in their super6c repo.