
The Raspberry Pi Compute Module was originally launched back in 2014, and all models shared the same 200-pin SODIMM interface that enabled it to be used in a carrier board — until the Compute Module 4. This meant that industrial customers wishing to upgrade their products from the Compute Module 3 / 3+ to Compute Module 4 needed to purchase new carrier boards. That was until Raspberry Pi released the Compute Module 4S. Initially Module 4S was offered with just 1GB of RAM, but today Raspberry Pi has announced that it will be offering Module 4S in 2, 4 and 8GB variants.
