"The Radxa X4 is a credit card-sized single-board computer with a Intel N100 quad-core processor, support for up to 16GB of RAM, and an M.2 connector with support for PCIe 3.0 x4 NVMe SSDs or other expansion cards. At first glance, the little computer looks a lot like a Raspberry Pi Model B. Both computers feature 40-pin GPIO headers and a mix of USB, Ethernet, HDMI, and audio jacks. But while Raspberry Pi’s computers have ARM-based chips and rely on microSD cards or expansion boards with M.2 slots for storage, the Radxa X4 has an M.2 223 connector and optional support for an eMMC flash storage module."
Source: Liliputing