Which card (speed?) for 5D Mark IV 4K?

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Kaitlyn Regular Member • Posts: 403
Which card (speed?) for 5D Mark IV 4K?

I've got a Lexar 1066x 64GB CF and a Lexar 633x 64GB SD card that I'm normally using with my 5D, and randomly realized that storing videos on the SD means I can't record 4K, but it seems to work reliable on the CF.

A quick look shows that the 64gb SD card has write speeds of 46MB/s, but the 4K footage is 500mbit... ~63MB/s. Is this correct? It looks like the sandisk Extreme wouldn't be fast enough at only 40MB/S for 64gb (128gb is faster)... so this is even slower than the Lexar? Does this mean basically lexar 1066x or sandisk extreme pro are the only options?

I prefer SD just because it's easier to work with as my laptop has SD reader

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