Different SSD Benchmarking Numbers Between W7 and OSX

Discussion in 'MacBook' started by Maverick1337, Jul 27, 2012.

  1. Maverick1337 macrumors 65816

    Maverick1337

    Joined:
    Nov 4, 2008
    #1
    I just installed a new SanDisk Extreme 240GB SSD and tried out some benching. It's on a Macbook 4,1 which is limited to SATA I speeds and I used AJA and BlackMagic benchmarks and got around ~120MB/s seq. R/W speeds. I boot camped windows 7 and just now benched using crystaldiskmark and got ~170MB/s seq. R/W speeds. I'm confused and don't know which one to believe. I heard that SSD's are usually slower at the beginning because there isn't a lot on them but now that I have Windows 7 on it, that's an extra 15 gigs of stuff. If anyone has any information at all I would greatly appreciate it, thank you.
     
  2. robvas macrumors 68020

    Joined:
    Mar 29, 2009
    Location:
    USA
    #2
    CrystalDiskmark uses all zeros so you will see higher speeds than BlackMagic. This is because of the Sandforce compression feature.
     
  3. Maverick1337 thread starter macrumors 65816

    Maverick1337

    Joined:
    Nov 4, 2008
    #3
    The default is "random" and I even tried both and got the same results.
     
  4. robvas macrumors 68020

    Joined:
    Mar 29, 2009
    Location:
    USA
    #4
    Hrm, I could see there being driver differences between W7 and OS X, and that causing slight performance differences. But it's a mystery why it shows over 150MB/s

    Is there a tool that shows the link speed in Windows?
     
  5. Maverick1337 thread starter macrumors 65816

    Maverick1337

    Joined:
    Nov 4, 2008
    #5
    Well it's SATA I which is 1.5Gb/s = 187.5MB/s (divide by 8, bits to bytes) so 170 isn't abnormal by any means.
     

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