Thread: CFast Cards: Does size really matter?

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  1. #1 CFast Cards: Does size really matter? 
    Member thedwp's Avatar
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    I just ordered an Ursa and was faced with the inevitable decision as to which CFast cards to go with. I got a free Wise Advanced 128GB with my Ursa order and I also added a Lexar 128GB (from the approved BM list).

    Now I've seen some comments indicating that the larger cards (256gb) seem to perform better all the way around (faster & more reliable). Here's a quote from one of the guys from the BM forum:

    I bought several Lexar 256GB cards and they have been amazingly reliable both in 4k RAW and ProRes 4444. Many many dozens of hours recorded in both formats with no dropped frames or problems. I also have 4 of the SanDisk 128GB cards and they randomly "eject" from the URSA and won't remount until they are reformatted. In other words, be wary of cheap or non-approved cards. You get what you pay for.

    I know in his quote he said the SanDisk cards failed, and I'm aware of the recent BM announcement about taking the SanDisk cards off the approved list.

    Can anyone who's been working with the Ursa comment on this? Does this seem to be the trend with these cards? Larger=faster/better?
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  2. #2  
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    Thank you!! I was just about to order a bunch of Sandisk 128s. Cancelling that!

    The review on BHPhoto sounds really good. 45 mins. ProRes HQ 4k.

    Sounds reasonable that a larger card would have less errors...
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  3. #3  
    Senior Member jambredz's Avatar
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    Yeh well the sandisk isn't on the approved list. So....that's the problem I see here, not bigger being better. Maybe u can try testing your wise card and see....since that actually IS on the list.
    Darren Scott
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  4. #4  
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    Yes, sort of a mute statement. One card is not approved and it's new firmware does not work Vs a card that does. Of course the cards that are approved will work better.

    Why do I have a feeling we're going to see countless rants at BM when the URSAs come out about CF cards not working that aren't on the list just like the Pocket.
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    We need a stress test of the Lexar 128GB versus their 256GB cards. I suspect in that test the larger card will perform better. We know that no card theoretically can write ProRes 444 XQ UHD 60 fps since the data rate is about 500 MB/s. The larger Lexars are approved and are rated at 450 MB/s. I am curious to know if it will work at 60 fps or higher if one only fills the card to half capacity. Anyone on good terms with a vendor that will provide you cards to test at HFRs?
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    There is a post on the official forum from Guy Fiorita who tested both the 128 GB and 256 GB Lexar 3400x cards. The larger card's performance was considerably above the smaller card. The Blackmagic Speed Test was used to see if there was a difference and it's significant. Not as useful a test as in an URSA/Mini but clear evidence sometimes bigger is better.

    http://forum.blackmagicdesign.com/vi...=35023#p207193
    Last edited by rick.lang; 04-29-2015 at 03:20 PM.
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  7. #7  
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    Here's the link to the supported cards page, just in case anyone is reading this thread and wondering whats on the list.

    https://www.blackmagicdesign.com/support/faq/59008
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  8. #8  
    Senior Member jambredz's Avatar
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    I don't really follow the Ursa that much but doesn't it do like 80+ fps now? I see nothing on the list that says that's supported. But I guess it is supported by the cards yes?
    Darren Scott
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  9. #9  
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    Quote Originally Posted by jambredz View Post
    I don't really follow the Ursa that much but doesn't it do like 80+ fps now? I see nothing on the list that says that's supported. But I guess it is supported by the cards yes?
    Actually 150fps in windowed 1080!
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  10. #10  
    Senior Member kgimedia's Avatar
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    No matter what she says size does matter.
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