On the wiki there’s info how you can add mulitple servers for load balancing but what I have done is added little more RAM to my workstation to improve performance and I have imaged about 7 computers at a time and haven’t had problems. I am not sure why you are using such a powerfull system when I have FOG on a quad core HP5800 workstation with 4gb of ram and haven’t had any problems. I have a 1tb drive as local sotrage and when I need to backup, I copy them to our extrnal USB drive that goes offsite. No performance downgrade whatsoever. Still deploys image at a gigabit speed.
You can deploy to multiple workstation and what you do is create a txt file with the MAC addresses, then upload to fog. The MAC addresses will be in the FOG database then you create a group if you want and deploy.
Or you can go thourgh the fog webinterface, register each workstation and then put them in a group and deploy without having to create the txt file.