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Occasional Contributor
Posts: 5
Registered: ‎01-11-2017
Accepted Solution

5D MK3 CF write speed

I can't seem to find information on the maximum write speed capability of the 5D MK3. For example, will there be any benefit moving to the Sandisk Extreme PRO CFast 2.0 with 425 MB/S write speed versus the  SanDisk Extreme UDMA 7 at 120MB/S? All the information I have found is for CF cards maxing out at 160 MB/S, which shows just a slight improvement over 120 MB/S, all else being equal.


Any insight is appreciated.



Super Contributor
Posts: 232
Registered: ‎11-03-2015

Re: 5D MK3 CF write speed

Hi PHenry. The EOS 5D Mark III is not compatible with CFast cards. You can find more information on tested cards as well as speeds for different functions here


We hope this helps!

Occasional Contributor
Posts: 5
Registered: ‎01-11-2017

Re: 5D MK3 CF write speed

Thanks! Exactly the info I couldn't find. I need to brush up on my search term creativity :-)


Respected Contributor
Posts: 1,032
Registered: ‎11-14-2012

Re: 5D MK3 CF write speed

[ Edited ]

Fastest write speed I have seen with a 5DIII and CF has been around 120MB/s together with KomputerBay 128gb 1066x. Read speed was around 155 MB/s. Fastest write speed with a 5DIII and SD is 21 MB/s.

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