I'm just wondering what's the fastest SD card people have used and still get the speed benefit?
I remember reading there was a limitation/issue with the SD card slot of the 5D3 - does anyone remember what that was?
Not updated since March 2013 but still informative...http://www.robgalbraith.com/camera_wb_multi_page7de5.html?cid=6007-12452
You can see that there are fast CF cards and some that are slower than SD... You can also see that spending the money on a fast CF, and only writing RAW to that slot, will give you the maximum results... You can also see that, incrementally, the faster SD cards will still do a little better...
Me, I have (2) SanDisk Extreme Pro 32GB CF cards and (1) SanDisk Extreme Pro 64GB SD card... I write RAW + Large JPG to each card - I have never hit the buffer... Then again, I am not a spray-and-pray photographer - I bought the 5DIII because that second slot buys you peace of mind... Every shot is recorded in both formats to both cards - have never lost an image with SanDisk - cannot say that about Lexar cards that I have owned... YMMV...