You have six ports, Im sure you can run six but dont quote me on that.
I can test at work with three easily (we have five but two are attached to another room).
The old mini display is the same shape as thunderbolt so yes it works on it.
Just cant go backwards e.g. thunderbolt peripheral into mini display port.
Im using two Cinema 30s on a single bus now and so far so good![]()
Do you mean on a single Thunderbolt port?