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The X Factor

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  • What you need to know about memory-card speed

    This Article Features Photo Zoom

    the x factorIt used to be that a small group of people, such as pro photographers, needed high-speed cards. But as manufacturers develop higher-resolution cameras, file sizes are growing larger and therefore taking longer to record to a memory card. Using a high-megapixel camera with a standard-speed card creates a lag time between shots because of a slow write speed and lengthy download times to your computer because of a slow read speed.


    the x factorCompactFlash and Secure Digital are the memory-card formats typically categorized by the x factor. Secure Digital High Capacity (SDHC) speed class ratings are standardized and more objective. All SDHC cards that are Class 4, for example, can write at the speed of 4 MBps. Class 6 cards write at a minimum of 6 MBps.

    ATP ProMax II CompactFlash cards (atpinc.com) deliver read speeds of up to 45 MBps and write times of up to 30 MBps. The cards are UDMA-compliant and have capacities of up to 16 GB. Estimated Street Price: $185 (8 GB).

    Kingston’s 32 GB Elite Pro SDHC memory card (kingston.com) has a Class 4 speed rating and is particularly useful for shooting high-definition video. Estimated Street Price: $247.

    the x factorLexar (lexar.com) has upgraded several of its cards, including the UDMA-compliant Professional 300x 16 GB CompactFlash card featuring a 45 MBps write speed. The Professional 233x CompactFlash cards come in 2, 4 and 8 GB capacities with 35 MBps read/write times. Estimated Street Price: $359 (16 GB CF).

    The PNY 16 GB Class 6 Optima Pro SDHC card (pny.com) has a 6 MBps transfer rate, ideal for high-megapixel cameras and demanding camcorders. Estimated Street Price: $119.

    With a 30 MBps transfer rate, the SanDisk Extreme III 32 GB CompactFlash card (sandisk.com) doesn’t sacrifice speed for capacity. Estimated Street Price: $199.
    Labels: Memory CardsGear

    2 Comments

    1. Prices of memory card have been falling lately, especially, the SD cards. You can now get 16GB cards for under $20, including shipping. However, as this article points out not all cards are created equal. Before comparing prices, be sure to checkout the transfer rates, so that you are comparing apples to apples.
    2. Thanks very much for the "complete" explanation in plain English. I appreciate it.

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