GTX 1050 and GTX 1060 in one computer.

Solution
I did a brief search on using 2 GPU's for video rendering. As a suspected, video editing and rendering speed is mostly determined by your CPU cores & performance. Depending on the video software you're using, some small amount of work is offloaded to the GPU (unless you're using a nVidia Quatro GPU & Adobe Premier).

I'd suggest putting the 1060 card in the slot closest to the CPU and using it as the main GPU - connect your monitors to it. Render a video and time how long it takes. Put in the 1050 card. Then render the same video. See if you have any time savings.

Note - from a gaming perspective, neither the 1050 or 1060 cards are SLI compatible. So, there's no advantage to adding the 1050 as a second GPU.
I did a brief search on using 2 GPU's for video rendering. As a suspected, video editing and rendering speed is mostly determined by your CPU cores & performance. Depending on the video software you're using, some small amount of work is offloaded to the GPU (unless you're using a nVidia Quatro GPU & Adobe Premier).

I'd suggest putting the 1060 card in the slot closest to the CPU and using it as the main GPU - connect your monitors to it. Render a video and time how long it takes. Put in the 1050 card. Then render the same video. See if you have any time savings.

Note - from a gaming perspective, neither the 1050 or 1060 cards are SLI compatible. So, there's no advantage to adding the 1050 as a second GPU.
 
Solution