Memory card speed

Discussion in 'Digital SLR' started by Frank Arthur, Dec 19, 2007.

  1. Frank Arthur

    Frank Arthur Guest

    From Ebay's chart
    Memory card speed is the card's performance with regard to how quickly
    data can be transferred to or from it. The card speed is often stated
    in -Times- ratings i.e. 12X, 40X etc (just as the speed of recordable
    CD's and DVD's is measured), and sometimes more specifically in
    megabytes per second (Mb/s). By today's measure, sub 20X represents a
    standard speed, 20X to 40X is mid-high speed and over 40X is high
    speed. The chart below shows the relationship between the two figures.

    8X = 1.2 Mb/sec
    12X = 1.8 Mb/sec
    20X = 3.0 Mb/sec
    25X = 3.8 Mb/sec
    30X = 4.5 Mb/sec
    40X = 6.0 Mb/sec
    60X = 9.0 Mb/sec
    66X = 10.0 Mb/sec
    80X = 12.0 Mb/sec
    90X = 15.0 Mb/sec
    133X = 20.0 Mb/sec
    Frank Arthur, Dec 19, 2007
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  2. Frank Arthur

    gpaleo Guest

    In a VERY perfect world.
    Usually 150x cards manage about 15 MB/sec
    gpaleo, Dec 19, 2007
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  3. Frank Arthur

    Ray Paseur Guest

    Group: This is an interesting chart. A bit over a year ago in another
    forum, we had a conversation that centered on the difference between
    Sandisk Extreme III and Extreme IV CF cards. The gist of the discussion
    was that the difference in speed of the cards was not relevant to image
    capture -- the camera buffer size and speed was the controlling factor
    on that end. The CF card speed DID matter in downloads from the CF card
    to the computer, with the faster Extreme IV saving from several seconds
    to a few minutes when downloading a large, full card. I have never
    truly benchmarked the cards but I can definitely see a difference on the
    download end. What are your experiences on this topic? ~Ray
    Ray Paseur, Dec 20, 2007
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