sound card test

I do not think that there is an out of the box testprogram for your soundcard. This is not to be expected. You have to learn using your soundcard with REW and then you are able to check the soundcard parameters that are important to you. Calling for more audio SW tools is not the way.
 
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Piggybacking on to this, does anyone has a recommendation for top performance sound card?
Cost no object.

Jan
I'm also using RME, fireface UCX, hard to find downsides of it, but I did not dig into specialists devices, so recommending with reservations.
Conviniently it has more in-out than needed, small forms factor, processing on board and asio drivers.