I've been trying to find a good article, on a deep-dive into the ASA5500-x architecture. I remember reading once, with the older 5500 series, that depending on how many ports you are going to actively use, you may want to add an additional port module, if you can, for better performance. Also, with the 5515-x series, have any of you run over 80 IPSec tunnels? I was just wondering how to calculate performance when it comes to these features. Alsod, does anyone know of a stable version from 8.6 to the current 9.1 I believe? I'm still trying to do my own research, but figured I would see what you guys think as well. Some of you are more experienced with the new ASA's than I am.