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Old 16th July 2019
Lives for gear

32 gig is plenty.
Native stuff is computer processor based. However, the HDX mixer needs to transfer the mixer signal from the HDX card to the computer processor to do that processing (and then back.) That uses your hardware buffer size in Pro Tools. This is the same as TDM and RTAS plugins.

For UAD stuff, you need to follow their rules: macOS version, right update of the UAD software.

Also, what sample rate are you running and what buffer size for Pro Tools?

No matter what, though, UAD is not good for tracking without an Apollo.