"CPU isn't supported"

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  1. spapakons's Avatar
    Posts : 2,714
    Windows 10 Pro 64-bit 1803 (April 2018 build 17134.472)
       15 Mar 2016 #41


    Generally I agree. Although updating the BIOS is very risky, it is a good idea to do so when installing a new operating system (not just Windows 10, it could be anything). This way you maximize compatibility with newer technologies that your current BIOS may not support properly. Next step is to download any drivers beforehand. A common scenario is that you cannot connect to the internet before installing the LAN or Wi-Fi driver and hence you cannot download any drivers, unless of course you have a second computer you can use. So update the BIOS to the latest available (in some cases this could not be enough so you have to update to the last BETA version which is newer than the last release version), and then download all drivers for the target OS or similar (Windows 7 or 8 if Windows 10 drivers are not available). Once you have all the drivers, you can proceed with the installation of the operating system.
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  2.    04 Jun 2016 #42

    flashh4 said: View Post
    Hey gang i have a friend who got this message "CPU isn't supported" when they tried to upgrade to W10. We tried the Media Creation Tool and it came back with "You can't install Windows 10 because your processor doesn't support CompareExchange128". So where do i send her from here ?? Read some articles that says MS will change their download requirments later to allow everyone to download, not sure i'm believing that !!

    Anyone got any suggestions for a work around on those messages above ???

    Running W7

    Try this quick and simple tool to see if your CPU is supported for Hardware Assisted Virtualization

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  3. spapakons's Avatar
    Posts : 2,714
    Windows 10 Pro 64-bit 1803 (April 2018 build 17134.472)
       05 Jun 2016 #43

    "CPU doesn't support CompareExchange128" message means that it doesn't pass the 64-bit test, but you may be able to install the 32-bit version. Try updating BIOS just in case you improve compatibility. Hacking the kernel to upgrade an earlier version of Windows to 8 or 10 is much more difficult than hacking the kernel to do a clean installation. I did it once with much trial and error and I am not sure how I did it, so I cannot help you do it. Sorry.
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  5. spapakons's Avatar
    Posts : 2,714
    Windows 10 Pro 64-bit 1803 (April 2018 build 17134.472)
       10 Jul 2016 #45

    He suggests to update the BIOS to improve compatibility. Exactly what I said, without knowing most of the technical details he mentioned.
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  6. Posts : 326
    Windows 7 Home Premium x64
       08 Sep 2016 #46

    jds63 said: View Post
    See it now from mine, found it with AIDA64, one highlighted and one after to

    Attachment 31623
    I looked at the jds63's AIDA64 CPUID report closely and CMPXCHG16B support is checked (aka supported) BUT the PREFETCHWT1 support is not checked (aka. NOT supported) - Win10 x64 installation will fail if PREFETCHW support is not there. Need to be sure that his CPU has both CMPXCHG16B and PREFETCHW support to run 64bit Win10; otherwise go with installing x86/32bit Win10.
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