Is there a way to choose which video card MCEBuddy will use for encoding?

I’ve got a lower end NVidia card in my server - I managed to get a Thunderbolt breakaway external graphics box to put my old gaming card in it. Is there a way to tell MCEBuddy which of the two video cards I should use? Both are NVidia.

Thanks! Will.

Nevermind, the performance of the graphics card over Thunderbolt is terrible!