Always consult the Owners Manuals
Yeks Guide to the Fractal Audio Drive Models
From Axe-Fx II Wiki
Forum member Yek (Alexander van Engelen) describes each Drive model in his Guide to the Fractal Audio Drive Models.
The guide was preceded by a series of threads by Yek on Fractal Audio's user forum. Forum member Simviz assisted with assembling the contents of the threads into the guide. The guide is more complete than the forum threads and is updated periodically.
Brief information about the Drive models, derived from the threads and guide, is provided on this wiki page.
If you find the guide useful, consider donating as explained in the guide.