« on: July 07, 2014, 12:17:34 AM »
you mention that your main concern is shooting at 12fps.
Think about the following, A RAW file is appro. 20-25 MB, so at 12 fps, you need to be able to to have a write speed of let's say 12*20=240 MB/s. The current cards do not have write speeds that can keep up with this.
So, what will happen is that the internal buffer will fill up and then things will start to slow down.
As far as I know , the 1DC and 1DX have a 1 GB buffer, so that is ~ 40- 50 RAW files, which means four seconds continuous shooting at 12 fps.
I use the 12fps a lot on my 1DX for BIF, and sofar I have never shot a sequence of more then 20- 30 photos in one go.
If I do, I notice a short delay of two , three seconds for the buffer to write to CF cards (Lexar 32Gb, 1066).
In short, the card write speed is such that it will not be able to keep up shooting 12 fps in RAW format.
What it will do, is influence the time it takes to write from the buffer to the card.
I am more worried about cards that fail. I have bought many lexar and sandisk cards all of them 16GB or 32 GB and I have had failures on both brands. Failure: unable to read/write to card, unable to format, so they end up in the bin.
This is for me the main reason to use many smaller cards instead of going for a few high capacity ones.