EB7 external chassis compatibility

Hello,



this is my system:



Pro Tools 8.0.1 HD5

7slot PCI Express Expansion System (model: EB7-DIGI rev: B)

MacPro 4.1

Mac OSX 10.5.6







I would like to upgrade my OSX to Snow Leopard 10.6.8.



Is this possible continuing using the Expansion chassis E7B?

If yes, which version of PT 8 HD I need to install?



I tried to find informations but some documents says it's not possible, someone say it works…can you help me? Have you direct experiences?



Thank you very much

Best Regards,

Luigi