It’s saturday night and I have nothing better to do than test the speed of the Kingston Ultimate 266x CompactFlash 16GB and 32GB cards for video-oriented use. I’m working with the 16GB version in my Magic Lantern Firmware Canon 5D Mark II from 2 years and I’ve never experienced buffer overflow problems with the default BitRate (Magic Lantern BitRate). In the last week I buyed and used the 32GB version and something went wrong. I noticed an overflow when I start recording just after that I had turned on the camera and started the live view. Instead waiting one second before start recording everything works fine. So I decided to make some test.
I tested the two Kingston cards with Blackmagic Disk Speed Test, a free Mac OS X utility app available on the Mac App Store.
Compact Flash Kingston Ultimate 16GB 266x speed test:
Compact Flash Kingston Ultimate 32GB 266x speed test:
As you can see the 32GB is a little bit slower, in writing mode, than the 16GB version. The 32GB is also more fickle than the 16GB, and the writing speed range from 3.8 MB/s to 4.8 MB/s.
I took note of the Magic Lantern Buffer value too:
My opinion is that if you plan to maintain the default BitRate (the Magic Lantern default is also the original firmware default) and you want a cheap solution to start shooting this can be the minimum requirement. But if you have to shoot more FPS or at an higher BitRate go for a real 600x, 800x or even better for a 1000x writing speed. Don’t forget that the Magic Lantern community is trying to unlock the Raw format!