Can 5d mark iv and UHS-II cards

smaruzzi · Apr 19, 2017

Hi,

I recently bought the Lexar Professional 2000x 128GB SDXC UHS-II/U3 (Up to 300MB/s Read), and it works fine with the camera.

Tested a sequence of consecutive shots and the buffer got busy after the 22nd shot. Replicated the same test with the Lexar Professional 1066x 128GB VPG-65 CompactFlash card (Up to 160MB/s Read) and could reach 28-29 photos before reaching a bottleneck due to the transfer rate.

Very empirical and superficial tests, but I came to the conclusion that the Canon 5d mark iv cannot take advantage of the higher write capabilities of the UHS-II card. While Lexar doesn't publish write speed, I read it could easily top 240MBs, almost 50% faster than the fastest CompactFlash card.

Correct conclusion?

Many thanks, Stefano

DtEW · Apr 19, 2017

It's established that the 5DMkIV doesn't support UHS-II mode.

https://www.dpreview.com/products/canon/slrs/canon_eos5dmkiv/specifications

(Scroll down to "Storage".)

BlueCosmo5050 · Apr 20, 2017

smaruzzi said:
Hi,

I recently bought the Lexar Professional 2000x 128GB SDXC UHS-II/U3 (Up to 300MB/s Read), and it works fine with the camera.

Tested a sequence of consecutive shots and the buffer got busy after the 22nd shot. Replicated the same test with the Lexar Professional 1066x 128GB VPG-65 CompactFlash card (Up to 160MB/s Read) and could reach 28-29 photos before reaching a bottleneck due to the transfer rate.

Very empirical and superficial tests, but I came to the conclusion that the Canon 5d mark iv cannot take advantage of the higher write capabilities of the UHS-II card. While Lexar doesn't publish write speed, I read it could easily top 240MBs, almost 50% faster than the fastest CompactFlash card.

Correct conclusion?

Many thanks, Stefano

While it doesn't support UHS-ii, the UHS-ii cards seem to perform better, I guess because they aren't maxed out when the SD slot is maxed out. For example recording 4k, technically you can do it on a UHS-1 card, but good luck. I can get UHS-ii cards to record 4k just as well as the CF card with no dropped frames.

This move by Canon doesn't really affect me, as it will shoot 4k with a fast enough SD card, it doesn't seem to slow the camera down for what I do. However it doesn't seem like the most wise move considering people that are buying the camera are keeping it for 4 years and most of us more like 8-10 years.

dave_bass5 · Apr 20, 2017

And of course transferring to your computer will be much faster than with slower cards.

I was using the very fast Lexar (2000x) UHS-II card in my 80D without any issues, but ive had write issues on my 5DV with it so stopped using it. Seems like maybe the latest FW update addressed this, it mentions SD card issues so i might try again.

BlueCosmo5050 · Apr 21, 2017

dave_bass5 said:
And of course transferring to your computer will be much faster than with slower cards.

I was using the very fast Lexar (2000x) UHS-II card in my 80D without any issues, but ive had write issues on my 5DV with it so stopped using it. Seems like maybe the latest FW update addressed this, it mentions SD card issues so i might try again.

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Can 5d mark iv and UHS-II cards

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