Famous in part for its small size, the Raspberry Pi line of inexpensive computers is famously no bigger than a deck of cards, and the Raspberry Pi 4 Model B measures just 3.4 x 2.2 x 0.4 inches.

With the Raspberry Pi 4, ... a cheap, low-power, highly extendable, hackable PC that shipped as a bare circuit board. ... One thing worth mentioning here is the case and board for the 4 GB model.

While the squarish Raspberry Pi 4 measures 85.6mm × 56.5mm, or 2.22 inches × 3.37 inches, the designers of the Pi 400 crafted an elongated custom printed-circuit board (PCB) to fit the Pi 400 ...