yet another CF vs CF

Started Nov 11, 2010 | Discussions thread
David Burren
Regular MemberPosts: 221Gear list
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SanDisk Extreme is NOT a dog in the 7D.
In reply to Chuck Steenburgh, Mar 4, 2011

Following up on an old thread....

Chuck says the SanDisk Extreme is "a dog" and it may well be in the D300s (which is also shown in the numbers on Rob Galbraith's site: http://www.robgalbraith.com/bins/content_page.asp?cid=7-10044-10297 ). HOWEVER, the SanDisk Extreme is great in the 7D, writing at about 39 MB/s.

My own analysis of the cards I had on-hand (9 models) with the 7D and the 5DmkII can be seen at: http://blog.davidburren.com/2011/02/cf-card-speeds-7d-and-5dmkii.html

The old "Extreme III 30MB/s" and the new "Ultra" are almost identical by my measurements, and yes I believe they have UDMA. I didn't have any Transcend or Lexar 400x cards to test with though, which could have been interesting giving the price difference between those and the 600x cards I did test.

Once you get past 25 MB/s or so, you'll probably only really notice differences with the 7D if you're shooting long bursts of RAW frames (which is the scenario I tested).

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