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Old Jul 14, 2011, 3:08 AM   #11
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The fastest CF Cards are UDMA 7 cards which have maximum write speeds of 100 MB/sec, or 667X. The fastest SD Cards are UHS-1 cards which have maximum write speeds of 90 MB/sec, or 600X.

The maximum theoretical write speed for CF Cards is 167 MB/sec, while the maxmum theoretical write speed for SD Cards is 133 MB/sec.

The SD Card Speed Class is a specification for the minimum sustained write speed, and has no equivalent in CF Cards.
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Old Jul 14, 2011, 4:31 PM   #12
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thanks for the info......

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Old Jul 18, 2011, 8:49 PM   #13
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I love the 5 year jump in this thread - especially the reference to 8GB for $700 (and only needed by professionals). Now we are all walking around with a handful of 16GB or 32GB SD cards.
I remember investing a couple of hundred for a 32MB (yes that's MB - not GB) CF card before leaving on a vacation in the late 90's.
In another 5 years I'll respond to this thread again and say "now we are all walking about with 32TB cards - I remember when capacity was measured in GBs").
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Old Jul 19, 2011, 8:16 AM   #14
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I remember when people thought 16MB was a big card. Now with all the video people take 16GB is starting to be4come small to some people...... I remember paying over $100 for a 256MB xD card once....... now my last card was a 16GB card for $26. How technology and prices have changed in the last 5 years. In 5 years we'll probably see a 1TGB card for $100.......

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Old Jul 19, 2011, 8:40 AM   #15
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I predict that, 5 years from now, CF cards will still be faster and cheaper than SD Cards.
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Old Jul 19, 2011, 12:41 PM   #16
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TCav your probably right but how many cameras will stil use CF in 5 years. It seems with cameras getting and staying smaller (and the fact that the new Fuji Bridge cameras only use SDHC, even though the form factor is large enough to handle a CF card slot) that only the most advance pro camera use CF anymore.

I'd say in 5 years SDXC will out sell or be out used over CF cards.......

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Old Jul 19, 2011, 1:02 PM   #17
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I have no doubt that you're correct. In fact, I suspect that's the case now.
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Old Jul 19, 2011, 1:46 PM   #18
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Cf are faster the sdxc or sdhc with the 600x and faster udma technologies. You can not get a sd faster then class 10 which is 30 while 45 is common with the lower prices udma cf. So speed wise cf is faster. Capacity they are very close with 32gb and 64gb now available.

But the best format is what your camera takes. Not to many dual formats anymore. Semipro and up, cf. Entry to advance sd seems to be the trend.
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Old Jul 19, 2011, 1:54 PM   #19
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Actually, the fastest SD cards are the UHS-1 cards. There is no Speed Class equivalent for UHS-1. Panasonic has released UHS-1 cards that can write at up to 80MB/sec. Also, some manufacturers have already released Class 16 cards. (Class 16 is currently unofficial, but will be part of an upcoming standard.)
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Old Jul 19, 2011, 2:03 PM   #20
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But they are not available yet. With what is out cf is still faster.
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