[lucienpalmer]

Originally Posted by Mishabou

I'm using PT Ultimate with Thunderbolt Native and DAD AX32. I thought one needs 2 x HDX card to get more than 64 I/O.

You need two HDX cards minimum to connect to a hardware Renderer. (Mastering Suite)

But the Production Suite can use Dolby Audio Bridge to communicate 130 channels on the same machine with Pro Tools. So technically, you don’t need any HDX cards for routing to the Production Suite.