How in Premiere pro to choose video the card?

When in Premiere pro there is an opportunity to choose video the card?

At me it is installed cards two video. But premiere prou automatically works with the weakest. A floor addressed in support a year ago. The recommendation was to disconnect weak and to leave only powerful. But it isn't possible to make it technically. I would like to buy the license for Premiere. But with such work of the program and the most important as support, I don't see sense to buy a product not the worker.