[glasswing]

Oh! this is great info. Extremely good info and saved me some serious gnashing of teeth trying to decide on the information provided by the vendors. I have been in close touch with Sonnet and they are very good, responsive people. I'll get the Avid Expansion Chassis for the HDX card just because I don't want to or have much time for tinkering and because it should have its own TBolt port to itself. So part of my angst is settled.
The Sonnet Echo III / Sonnet PCIe card will be for the VI samples.

My indecisiveness with the Sonnet Echo III / Sonnet PCI card is that I will probably only use one PCIe card in it. I guess that's okay.

Do you guys know of a good solution for my old SSD drives? I'd like to use them and have looked at various solutions to host them but can't make up my mind. Maybe I can use them for Pro Tools sessions? Good idea? I could make them into a Raid 0 maybe? I don't think it's a good idea to use the NVMe TBolt port for Pro Tools data or the Sonnet Echo III etc port. Mac Studio Ultra has four discreet ports.
Thoughts?

Thanks so much!