Sc card reader speed??

Discussion in 'Mac mini' started by ivnj, Jul 29, 2012.

  1. ivnj macrumors 65816

    Joined:
    Dec 8, 2006
    #1
    System Report says my internal sd card reader in my new 2011 mac mini bought on the 23rd from frys is 2.5 GT/s. What is GT/s?? How many megabytes per second is 2.5 GT/s??
     
  2. eutexian macrumors regular

    Joined:
    Jan 6, 2012
    Location:
    Mapperley, Nottingham UK
    #2
    GT/s is Ghz X 2

    I believe 2.5 is the standard for SD card reader hardware.
     
  3. Moriarty, Jul 30, 2012
    Last edited: Jul 30, 2012

    Moriarty macrumors 6502

    Joined:
    Feb 3, 2008
    #3
    2.5 GT/s on PCI-Express = 250MB/s

    This is how that's worked out... note 'b' = bits, 'B' = bytes, 8b = 1B.

    2.5 GT/s = 2.5 Gb/s = 312.5 MB/s... then you've got 8b/10b overhead so 312.5 * 0.8 = 250 MB/s.
     
  4. ivnj thread starter macrumors 65816

    Joined:
    Dec 8, 2006
    #4
    Thanks, but I'm not following. What overhead??
     
  5. Hexley macrumors 6502a

    Joined:
    Jun 10, 2009
    #5
    Overhead like "noise".

    Not bad to know that I can use faster SD cards with it. :)
     

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