The EOS R is the latest flagship full frame mirrorless camera, that Canon hopes will start a mirrorless revolution with shooters. But users were annoyed that Canon only included a single UHS-II SD card slot for recording their images. But it is what it is, and now the question is, what are the best media cards to use in your new EOS-R, especially when shooting in 4K? Well fortunately, someone has already done all the testing for you.
The Canon EOS R supports UHS-II SD cards which theoretically operate up to 312 MB/s. The highest average write speed during continuous shooting was 182.7 MB/s. The camera is also compatible with UHS-I cards and supports SDR104 (up to 104 MB/s). The fastest UHS-I cards averaged up to 75.6 MB/s write speed in the EOS R. – Camera Memory Speed
The testing of 113 different high end SD media cards was done by the website Camera Memory Speed, who used a single Canon EOS-R mirrorless camera, mounted on a stable tripod and actuated by a remote timer. The image shot was a detailed test scene with controlled lighting, and shot in Raw at a resolution of 6720×4480.
As for results, CMS found that the Lexar Professional 2000x UHS-II and the Prograde V90 UHS-II memory cards were the highest performing with an average write speed of around 182 MB/s write speed during continuous shooting.
But when it came to writing images from the image buffer in burst mode, both the Lexar and Prograde could only write 21 frames per second, while the winner was the Adata Premier One UHS-II 64GB card, which came in at 28 frames per second at 50MB Raw sizes.
For file transfer speeds, via USB-C, the Lexar 2000x UHS-II Rev E 64GB SDXC card transferred 200 RAW images totaling 10GB, to a computer with SSD drive took at an average read speed of 76.0 MB/s directly from the camera, while similar transfers using external UHS-II USB card readers averaged over 250MB/s.
After these three, the analysis indicated that the Sony SF-G UHS-II, Delkin Power UHS-II, SanDisk Extreme Pro 300MB/s UHS-II, Verbatim Pro II Plus V90 UHS-II and Integral UltimaProX2 UHS-II V90performed well for maximum continuous shooting performance with the EOS R.
Bringing up the rear, as you would expect, were several of the budget SD cards, even those made by leading SD card makers like SanDisk, Samsung, and even a few lower end Lexar models. Some Value SD cards, however, like the Lexar Professional 2000x UHS-II Rev B 128GB and the SanDisk Extreme Pro U3V30 256GB card were able to handle the test with notable results. In general, when it came to speed, the results indicated that 64GB cards could perform faster than higher capacity (and more expensive) cards.
So, when it comes to shooting Raw still images, and 4K video, it really does end up being “you get what you pay for.” The entire list of testing results can be found here.