Author Topic: Does speed of firmware card matter?  (Read 346 times)

zen_nudist

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Does speed of firmware card matter?
« on: September 06, 2019, 01:22:21 AM »
Question: Does the speed of the SD card I'm using to run magic lantern matter?

I can record onto my CF card (linked below) 1920x1080p at 24fps fine without limit, but not 30fps. It begins to skip frames after 15-20 seconds when going 30fps. Alternatively, I can record 1600x900p at 30fps fine without limit.

The SD card has max of 27 MB/s. It's linked here:
https://www.bhphotovideo.com/c/product/895449-REG/Lexar_lsd8gbbsbna200_8GB_SDHC_Memory_Card.html

The CF card--I know--is fast enough. It's the Lexar 1066x 160 MB/s.
https://www.bhphotovideo.com/c/product/1022078-REG/lexar_lcf128crbna1066_128_gb_pro_compact.html

Walter Schulz

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Re: Does speed of firmware card matter?
« Reply #1 on: September 06, 2019, 07:43:34 AM »
"I know" can mean two things:
- I have tested it and numbers are within expected range.
- Other have tested a card that looks like mine.

AFAIK there are at least 2 different versions of this card and there is - at the moment - no way to tell them apart but to run a benchmark test and draw conclusion. One has superior write performance > 100 MByte/s (tested with ML's benchmark module). The other will do just about 81 MByte/s.
If you have a decent cardreader you may test/confirm with PC you got the fast one. Or use ML's bench.mo.
Photogs and videographers: Assist in proof reading upcoming in-camera help!. Your input is wanted and needed!

zen_nudist

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Re: Does speed of firmware card matter?
« Reply #2 on: September 07, 2019, 05:52:34 AM »
Well hot damn. Yep, I've got the slow one. 79.8 MByte/s write. That's nowhere close to the 155 MByte/s speed advertised. Do you have recommendations for faster cards?

Walter Schulz

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Re: Does speed of firmware card matter?
« Reply #3 on: September 07, 2019, 09:15:26 AM »
Either contact your reseller and let them replace the item with a fast one. Or go Sandisk Extreme Pro known for endurance and performance. Komputerbay may also be an option but mixed experience with reliability.
Haven't heard from users of Toshiba Exceria Pro, though.
See www.cameramemoryspeed.com
Photogs and videographers: Assist in proof reading upcoming in-camera help!. Your input is wanted and needed!

zen_nudist

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Re: Does speed of firmware card matter?
« Reply #4 on: September 09, 2019, 06:32:36 AM »
Thanks, Walter Shultz!