Testing the latest crop of U3/UHS-1 SDXC cards in a 6D
I need to upgrade to faster storage medium for my 6D.
If anyone is using one of the newer U3/UHS-1 cards, would you mind posting a simple test for me.
1. Type of card.
2. At 4.5 frames/second, please specify the number of RAW (not mRAW or sRAW) images that the camera will complete before it slows down (buffer full).
3. If possible measure the camera reduced frame rate after the buffer fills. Count 10 frames after the buffer is full while watching a clock with a second hand. (12 seconds for 10 frames is 1.2 frames/sec).
4. How long does the buffer take to empty after you release the shutter button.
I tested my Patriot LX series 32GB class 10 SDHC cart and had the following results:
14 frames at a full 4.5 frames/sec.
20 seconds for the next 10 frames = .5 frame/second.
32 seconds to clear the buffer after shutter release (light off).
I was shooting the wall clock I was using to time with for this sequence.
I'm looking at the Transcend 64GB U3/UHS-1 (claimed write speed of 60MB/sec.).
Thanks for taking the time to test and posting the results.
6D, 17-40L, 70-200L 2.8 IS, 50 1.4, 85 1.8, 50 2.5 macro
7D, 17-55 2.8 IS, 60 2.8 macro
Hi Cicopo, thanks for your input.
I had found this website earlier today. The author is kinda biased towards Nikon (7 different models) and only one Canon. Never the less still an awful lot of useful information presented. Looking at the Nikon D600 tests. I suspect it and the Canon 6D are very similar in the speed of their UHS-1 interface.
Another interesting site is:
http://www.thessdreview.com/hardware/flash-drives/samsung-pro-microsdxc-uhs-1-u1-card-review-64gb/3/
The author has done in depth testing on a number of the newer SDXC cards. He concludes his articles with a "real world write test" using a Canon 6D (lucky me). The test is fairly simple, count the number of frames @ 4.5 frames/sec until the buffer fills and then time the buffer offload.
What I got from both sites is the new Samsung Pro offers the biggest bang for the buck (2 more frames/sec in the 6D. before the buffer fills over the SanDisk Extreme). According to their website the cards are hardened much like the SanDisks, but doesn't say anything about ECC circuitry.
If anyone has any input or opinion of the Samsung Pro vs the SanDisk Extreme please do.
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