Windows 8.1 x64 installation without PrefetchW Support?

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no, this is not possible. The only way to install Windows 8.1 on this CPU is to use the 32Bit (x86) Version which is recommend when only using 2GB of RAM.

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CodeIt
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CodeIt

Updated on September 18, 2022

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  • CodeIt
    CodeIt over 1 year

    I'm having Intel(R) Pentium(R) 4 CPU 3.00GHz Processor with 2GB RAM. While trying to install Windows 8.1 Pro 64-Bit i gave me an error saying that the processor is not compatible with Windows 8.1 Pro 64-Bit .I checked the system requirements and found that my processor doesn't support PrefetchW but all the other requirements are supported.

    HTT * Hyperthreading enabled

    X64 * Supports 64-bit mode

    NX * Supports no-execute page protection

    PAE * Supports > 32-bit physical addresses

    SSE2 * Supports Streaming SIMD Extensions 2

    CX16 * Supports CMPXCHG16B instruction

    PREFETCHW - Supports PREFETCHW instruction

    Note : '*' means it's there(supports) and '-' means it's not there(doesn't support)

    I know i'm asking a poor question. But i want my old processor to run Windows 8.1 64Bit anyway. Is there any way to run Windows 8.1 64 bit without PrefetchW support?

    • whs
      whs about 9 years
      You could try to disable superfetch/prefetch ==> tomshardware.com/reviews/ssd-performance-tweak,2911-5.html
    • CodeIt
      CodeIt about 9 years
      @whs My processor does not support prefetchw
    • whs
      whs about 9 years
      I know. That's why I suggested to set it off in the OS. However, I am not sure whether it will let you install the OS in the first place.
    • Psycogeek
      Psycogeek about 9 years
      If it is an option superuser.com/questions/831394/… looking at the web the 3 items PrefetchW & LAHF/SAHF & CMPXCHG16B effects the 64bit OS versions. From what i can tell so far, the 32bit OSes do not have that problem.
    • CodeIt
      CodeIt about 9 years
      @whs I'll try and will give an update.
  • akostadinov
    akostadinov over 6 years
    for a reference for anybody wondering how things work on later CPUs without that capability - superuser.com/questions/931742/…
  • Alex Cannon
    Alex Cannon over 3 years
    Removing prefetchw instructions from an executable is a very easy modification. They can all be replaced with NOP instructions. Then you just have to bypass the Windows installer check, and Windows File Protection, and then make sure update files are modified too. There was talk of a patch back when 8.1 came out but I'm not sure of the current status of it.