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no you cannot use 280MB/s at full speed.

6d is rated maximum 45MB/s it cannot do more.
5d3 sd slot is about 20MB/s as i remember and it cannot do more. 5d3 you need to use CF card.

Please use the search function next time. This has been discussed several times in different threads.

thanks a lot~

6D raw video can be 1920x1080? If there is a SD card be signed "280MB/s"?

I have found that there is a Sandisk SD card, It was print on itself by 280MB/s. And the descrition says the writing speed is higher than  250MB/s.

So if I put the card into a 5d3 camera, can I record 1920 RAW video to it?
And If I put  the card into a 6d camera, can I record 1920 RAW video to it? Theoretically？

check this link :
http://www.sandisk.com/products/memory-cards/sd/extremepro-sdxc-sdhc-uhs-ii/?capacity=64GB