Top positive review
Very Fast CF card, doesn't seem to be faster than the 1000x but that's ok
April 14, 2014
So I got this card and it was immediately apparent that it was faster than my older 400x cards. I guess that is to be expected. Anyway, I started to wonder just how fast it was. I guess it's pretty new, there were no official reviews on the internet of this card
I did find this thread on the Fred Miranda Forum. [...]. Unfortunately there was no data available for this particular 1066x card. So, I decided I'd add my own. (I'm vw151 on FM) Here is what I found.
17-40L @ 24mm
Lexar 32 GB UDMA 7 1066x ------------156 shots in a 30 sec burst
I did the test 2x got 155 once, 156 once
Another metric I thought might be useful in this thread was total size of the files produced to account for the difference in file size made by different cameras. The 1Dx vs the 1D4 for instance.
Anyway in both cases, my combined total file size was about 3.19GB Do the math and that works out to about 106MB/second. File sizes are about 21MB per image. I think the frames recorded plus this data gives a clear picture of the card's performance.
I have 2 cards. I'm gonna run the test 2 more times with the other card.
I did 4 more tests on the 2nd card but changed up the parrameters in the 2nd 2 tests.
155 shots 3.23GB RAW 12FPS Avg. 5.16 FPS 107.67MB/sec
148 shots 3.11GB RAW 12FPS Avg 4.9 FPS 103.67MB/sec
312 shots 1.57GB JPEG 12FPS Avg. 10.4 FPS 52.33MB/sec
324 shots 1.63GB JPEG 14FPS, Mirror Locked Avg. 10.8 FPS 54.33MB/sec
The interesting thing was, Jpeg @ 12FPS, It didn't sound like I ever got off the buffer but Jpeg @ 14fps it got into the buffer hard at about 10 seconds in. but it still made more pictures in 30 seconds.
I also see file transfer rates from the card to an SSD or RAID0 at around 115MB/sec.
Please keep in mind these are real world benchmarks, not lab tests. None the less, if I reproduced the test on the FM forum reasonably well it seems the write speed in a 1DX is no better than the 1000x which the tester managed 160 shots in 30 seconds. Nothing wrong with that as the 1066x is just the successor to the 1000x and it seems we are reaching the maximum of the CF interface with these cards.