The useful fork is inside the movie table
A short figure film can change its card requirement when the recording settings change, even though the camera remains an EOS R7. Canon’s specifications split the requirements by frame rate, compression and bit depth. In the 59.94/50 fps IPB Standard row, the 8-bit column asks for UHS Speed Class 3 or higher, while the 10-bit Canon Log 3/HDR PQ column asks for Video Speed Class V60 or higher. That is a concrete reason to know the intended mode before choosing the card.
The grouped table is not permission to assume every resolution label supports every frame rate. Select a mode actually offered by the camera, then read its matching row and column.
What the named SanDisk V90 adds
SanDisk’s Extreme PRO SDXC UHS-II V90 data sheet specifies a 90 MB/s minimum sustained video-write rating. Its up-to-300 MB/s transfer figures answer a different question. Those peak figures come with host and usage conditions; they are not a promise that an R7 records at that data rate.
For the documented V60 requirement above, V90 is not the minimum Canon specifies. A reader may still want one card for other documented V90-requiring equipment, but that is a wider kit decision. For an R7-only setup, a higher label alone does not establish a new picture-quality benefit.
A sensible shortlist
Put the exact recording mode beside the card’s full V90 model reference. The R7 has UHS-II support in both SD slots, but that does not make every recording task require the highest-labelled card. If the selected mode needs only the lower class listed by Canon, choose among cards meeting that requirement before adding performance for a second camera you do not use.
Keep capacity as a separate session-planning choice. This purchase is worth making when it meets a documented recording demand or a real shared-kit requirement, rather than when “300” simply looks more persuasive than “90” on the packaging.
Sources & further reading
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