Windows 8 and 8.1 Forums


Can't install 8.1 Preview on older computers

  1. #1

    Can't install 8.1 Preview on older computers


    After 3 days of fruitless searching and multiple attempts to install 8.1 I finally found the answer. My hardware does not have the required LAHF/SAHF support nor does it support Prefe6tchW. Why this matters now withe the 8.1 update when it does not matter with 8 is beyond me.

    See here: Can't install or upgrade to 8.1 Preview - Microsoft Community

    My old, reliable Dell Precision 370 is now at the end of it's long, illustrious life as far as new updates. I'll have to stay with 8.

      My System SpecsSystem Spec

  2. #2


    Lynnwood, WA
    Posts : 173
    Windows 8, Windows 7


    I saw this coming and knew it would throw some people off the boat but you have think about how many different hardware profiles there are and with the absence of that instruction set, extra code is required. This is also just an issue with AMD systems. If a Dell 370 had an Intel proc, it would be fine. Intel introduced the instruction set much earlier.
      My System SpecsSystem Spec

  3. #3


    The 370 has a Intel P4, single core, dual thread.
      My System SpecsSystem Spec

  4. #4


    Lynnwood, WA
    Posts : 173
    Windows 8, Windows 7


    Quote Originally Posted by Ztruker View Post
    The 370 has a Intel P4, single core, dual thread.
    Then yours is even older than I thought. I only saw this on AMD Dell 370s.
      My System SpecsSystem Spec

  5. #5


    According to the Dell site, it was manufactured in April of 2007.
      My System SpecsSystem Spec

  6. #6


    LAHF/SAHF, CMPXCHG16b & PrefetchW are requirements for 64-bit version, so 32-bit flavor may work !
      My System SpecsSystem Spec

  7. #7


    It does. I was able to successfully install the 32 bit version last night.

    Good enough to test/play with.
      My System SpecsSystem Spec

  8. #8


    Good to know ! Keep us posted on your thoughts about the preview !

      My System SpecsSystem Spec

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