ProGrade Colbalt 650GB & 325GB CFexpress Type B cards in Z 9
The key to the speed of the Z 9 and its Expeed 7 dual-stream wizardry is the writing speed to the memory and the write speed of the memory. It’s needed for 20fps Raws or 120fps Jpegs stills and 125 minutes 8K video to work so seamlessly. The Z 9 has two CFexpress Type B / XQD or dual slots (do yourself a favor and go CFexpress!). Optimized for high-performance CFexpress Type B cards, the dual slots are independent so you can load them with a CFexpress and/or an XQD, different sizes or write speeds. If you want your Z 9 to deliver all the speeds Nikon reports in the Z 9 literature/instruction book, the ProGrade Cobalt 1700 MB/s cards should be inserted. These are the cards tested with and used to come up with all those amazing write speeds. Personally, I have the ProGrade Cobalt 650GB in slot 1 and the ProGrade Cobalt 325GB in slot 2. I have the slots set up Slot 2 as overflow when shooting still and Slot 2 for recording video. I have also shot with the 1TB ProGrade and the 512GB Delkin Black in the Z 9 flawlessly. Most cards work in the Z 9, only some deliver the blistering speeds. Hope this helps.