There are some special cards that (ab)use the AGP bus for other applications than graphics.
There's some comments that the AGP isn't real or useless AGP 1x.
There is no "real" AGP bus on Pegasos 2 but it has AGP connector so you can use AGP cards on it. While it is just AGP 1x bus it is faster and more reliable than AGP 2x bus in Pegasos 1 or AmigaOne.
Efika has similar AGP implementation since there is no real AGP bus either but you can user either PCI or AGP cards on it.