[HOW-TO] Check for PrefetchW, CMPXCHG16b and LAHF/SAHF [Windows 8.1 x64]

Discussion in 'Windows 8' started by david_xross_2, Sep 2, 2013.

  1. david_xross_2

    david_xross_2 MDL Senior Member

    Aug 31, 2012
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    #1 david_xross_2, Sep 2, 2013
    Last edited: Sep 2, 2013
  2. StopExxon

    StopExxon MDL Novice

    Oct 5, 2009
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    #2 StopExxon, Sep 2, 2013
    Last edited: Sep 2, 2013
    Thanks for this. I wish Microsoft would just make a tool to run before install would make this a lot easier. I think this should be a sticky as more people will be looking to install 8.1 and finding info on this I had to to dig around. Looks like mine has gets the green light.

    For those running the tool, check lines:
    LAHF-SAHF * Supports LAHF/SAHF instructions in 64-bit mode
    CX16 * Supports CMPXCHG16B instruction
    PREFETCHW * Supports PREFETCHW instruction (towards the bottom)
     
  3. david_xross_2

    david_xross_2 MDL Senior Member

    Aug 31, 2012
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    I agree..This functionality should be added in Windows Upgrade Advisor..As these specific instruction sets are not listed on the manufacturer's technical database :D
     
  4. Enigma256

    Enigma256 MDL Senior Member

    Jan 17, 2011
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    Anything from the past 6 years should be fine. Most things from the past 7-8 years should be fine, too.

    Only a small handful processor models didn't support them, and they have long since been retired. With hardware that old, buying a new Windows license doesn't make sense when the money is far better spent on hardware. So this is really only an inconvenience for people pirating Windows onto old machines, which is why Microsoft didn't make a big deal out of it.
     
  5. MyDigito

    MyDigito MDL Member

    Aug 16, 2012
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    It's not working Win 7 x64? Any idea?:rolleyes:
     
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  6. david_xross_2

    david_xross_2 MDL Senior Member

    Aug 31, 2012
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    You have to run it via cmd. It is not GUI based :rolleyes:
     
  7. MyDigito

    MyDigito MDL Member

    Aug 16, 2012
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    #7 MyDigito, Oct 14, 2013
    Last edited by a moderator: Apr 20, 2017
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