RAW Shots Before Buffer Filled - CFast Cards
For these tests I take several samples so the speed isn't always the same between bursts. The Lexar 3600x had the most fluctuations.
The faster cards also allowed me to shoot for about 30 seconds before filling the buffer. The slower cards were about 7-15 seconds.
I know Canon advertises 170 RAW shots, but this is what you can expect to get in the real world with these cards.
Lexar 3600x - 300-400
Lexar 3500x - 330-400
Sandisk Extreme Pro - 140-145
Transcend - 300-370
Delkin - 150-170
Atomos - 95
Super Talent - 90