One of the most important advantages, in comparison with the first two EVE versions, is the support for the Adaptive Scalable Texture Compression (ASTC) algorithm, implemented first in the EVE3 and maintained in the EVE4 controller.
This means the image quality can be enhanced significantly without the need for greater bandwidth. In certain situations, the compression algorithm allows for smaller graphic files to use compression without losing picture quality. This, in turn, saves up significant areas of memory space, required in EVE1 and EVE2 controllers by larger font files and data-heavy images.
Further memory management and system resource improvements have been applied to the EVE4 controller thanks to the presence of a dedicated QSPI port for connection of an external flash memory chip, implemented first in the EVE3.
See the datasheet for further information.