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PostPosted: Wed Jun 08, 2011 6:57 pm 
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Joined: Thu Jul 22, 2010 3:13 pm
Posts: 247
Location: Slovakia
Somebody a few posts down asked if there is any performance difference between class 6 and class 10 in modern cameras.

However, i dont want to reply to that post, you will see later.

Today i got class 10 kingston, exactly it is Kingston SDHC 32GB class 10 ultimate x 100x
On blister, it says 20MB (yes, Bytes, not bits) per second read and 15MB/s write.

Before that i used GoodRAM 16GB class 6 SDHC card (i dont know any other details, i wanted to buy one more but could not find it anymore). Quite a decent card, i used it a lot also as a data carrier.

To make it even more interesting, i got what i believe is class 2 kingston 2GB SD card, classic non fast card.

Test one>
I took card, loaded into Canon 60D, captured 7 images in burst (raw and L fine quality) and after shooting last one i measured time until record LED turned off.

2GB- i did not make this test, it would take a looong time.
16GB class 6- it took 18 seconds until led turned off. Pretty slow actually
32GB class 10- it took 17 seconds. So there is a little advance, but not that much. I dont know if the limiting factor isnt the camera.

Test two>
Record HD video. Both of it went fine, 1920x1080 30i, without any stress.

Test three>
i took 700MB file, and looked for a write speed (in windows 7 explorer). Card reader was usb2 "active jet" brand, its pretty good.

2GB- 6.17MB/s average, 6.3 MB/s max.
16GB class 6- 9MB/s average, 9.17MB/s max
32GB class 10- 11.5MB/s average, 12MB max (not like 15MB/s claimed by Kingston)

So, between class 6 and class 10, there is not so much difference. What is interesting is that in windows card write test, it makes bigger difference than in camera.

Now - its your time. Take your card and make those simple tests. Lest find out actual performance for all cards.
The speed measuring is quite innacurate, it would want some specialized software for that, but i currently dunt have some.

One last thing - did you wondered how much images (raw and L fine) it can take? 951 vs 477!

I'm new to DSLR's, so please be patient and take my opinions with reserve. Thank you : ) Yes, i am Canon man.
Image Google + Image My picasa photos Image My 500px album
Canon 60D + 15-85mm f3.5-5.6 IS, Canon 70-200 F2.8L IS II, Canon 430EXII, polarizing filter 72mm,
Canon AT-1, 50mm FD F1.8
Canon A430,

 Post subject:
PostPosted: Wed Jun 08, 2011 7:48 pm 
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Joined: Sun Feb 15, 2009 12:59 pm
Posts: 6010
Location: The Netherlands
Protip: use crystaldiskmark, it's more accurate :)


I take pictures so quickly, my highschool was "Continuous High".

 Post subject:
PostPosted: Thu Jun 09, 2011 3:50 am 

Joined: Sun Jul 04, 2010 4:52 pm
Posts: 244
Location: NB, Canada
By going from a class 6 to a class 10 on my Canon T2i I noticed quite a difference in burst speed, burst quantity. But the major difference I noticed with the class 6 is that while recording a 1080p 30fps video and taking pictures simultaneously, the video would stop after 1-2 pictures. With the class 10 card, I can take as many pictures as I like during videos, and it just keeps on going.

But then again, the class 6 and class 10 were different brands / quality, which I find also plays a major role in SD card performances. Classes indicate the minimum performance of a card, not it's maximum nor it's sustained.

Cameras: Canon EOS 6D, Canon EOS Rebel T3i, Canon EOS Rebel T2i, Canon S90
Lenses: Tamron: SP 24-70mm F/2.8 Di VC USD, SP 70-300mm F/4-5.6 Di VC USD, Rokinon: 8mm Fisheye cine, Canon: EF-S 18-55mm f/3.5-5.6 IS Lens, 75-300mm f/4.0-5.6 III, and EF 50mm f/1.8 II
Retired camera: Fujifilm Finepix s700

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