How do I force an application to use a secondary, identical graphics card?

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I have two identical graphics cards, both nvidia 30 series. I have the option of running them in SLI with an NVlink but I have disabled it for my use case. Thing is, I usually use one for some background computation and would like to simultaneously use the other one for something else, like a game. This works well when any one of the apps support switching between which graphics card it uses, like setting pytorch to device 'cuda:1' or Bannerlord (the game) which supports this feature natively.However, when neither app support this both run on the same card and one usually ends up crashing due

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