I have a 1st gen Intel Mac Pro running 10.8.5 very happily with a Pro Tools PCIe system
10.6 is very old – so if someone is still on 10.6 there’s something really compelling them to stay put.
I also have an old G3 Pro Tools PCI system with an OS prior to OS X which I keep in storage in case I need to recover any sessions from the 80’s… but I certainly wouldn’t try and use it for sessions.
Rail