Raspberry Pi released the 2GB Pi 5 for $50, featuring a new D0 stepping of the main BCM2712 chip, removing unnecessary functionality. The new chip size is smaller, potentially reducing the price per chip. A test showed the Pi maxes out around 3.5 GHz. The smaller design may lead to improved efficiency, with the 2GB D0 model showing lower power consumption compared to the 4GB and 8GB versions. The new chip uses less voltage at certain clocks, indicating a potential for higher efficiency. Overall, the 2GB Pi 5 can be a great option for specific uses not requiring a lot of RAM.
https://www.jeffgeerling.com/blog/2024/new-2gb-pi-5-has-33-smaller-die-30-idle-power-savings