Questions about Extreme PRO SDXC

edit: 1080p (1920x1080): Feasible, with good compression (approx. 50:1) you stay under 30 MB/s.

The card will certainly work with the 90 D. However, at 200 MB/s it is excessively fast. You could also use a simpler and cheaper SD card.

No. The first Z7 requires XQD or CF express B cards.