I just started using this 64gb 150mb/s card for my slot 1, and an older 32gb 95mb/s card for slot 2. My setup is RAWs in slot 1, JPGs in slot 2. I haven't done any 4k with it but it has performed great so far.

I went with this SD card: https://www.amazon.com/gp/product/B00PLENZX4 it seems to be faster than the cards listed, would the cause an issue? I'm currently using a Samsung Pro MicroSD from my GoPro (w/adapter) but wanted a 2nd card. I will mostly be using the camera for video.