TL;DR It’s called the Raspberry Pi 2 Model ... used the Model B as their flagship product that sees new innovations first. When the Model B+ received a new form factor and more GPIO pins ...

The Raspberry Pi 4 Model B ... 2 W features a quad-core 1GHz processor with 512MB of RAM. It has built-in Wi-Fi and Bluetooth 4.2, though no Ethernet jack. There's also a USB 2.0 OTG port and 40 ...