Mining 1 GPU for gaming others for mining?

I wanted to use a GTX 750TI for gaming [League of legends, Osu! Minecraft etc] which should be able to withstand and an RTX 2060 for mining Bitcoin I bought this part.

http://www.amazon.de/...08WC9CWQ6/.

The RTX 2060 is connected to the PSU and the riser to the Sata to 6 PIN adapter.

Now I have the problem that all the programs and games are still running on the RTX 2060 instead of the GTX 750TI.

That was a bad choice. If you already want to mine BTC, then you should buy an ASIC for this purpose right away. Mining on this one, meanwhile outdated graphics card is not worth it.
If you want to play with a card, then you should also connect the monitor to it…

The GTX 750TI is connected to the monitor while none is connected to the RTX. Nevertheless, all programs and games are running on the RTX.

Then you shouldn't see anything from the games, unless you've somehow connected graphics cards to one another, or a setting in the driver options that the GPU of the 2060 explicitly uses for certain calculations.

For example, if I start Minecraft and press F3 to see the information, it says that it uses the RTX 2060.

Is there anything that is more worth mining?