Two Different GPUs Installed

RE: https://forums.geforce.com/default/topic/777330/geforce-700-600-series/control-panel-settings-for-gtx780-and-quadro-k4200-for-video-editing/

I posted in the GeForce forum and then found this site. Trying to learn how Adobe Premiere video editing might benefit from both GPUs, the GTX780 and Quadro K4200. So far, I see no benefit over having just one GPU installed. Could it be a matter of settings?