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  1. #1
    WS Lounge VIP access-mdb's Avatar
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    Win 10 requirements

    Windows 10 system requirements (https://www.thurrott.com/windows/win...m-requirements) says this (amongst other things)
    Processor: 1 GHz or faster processor or SoC (system on a chip). 64-bit versions of Windows 10 require a processor that supports CMPXCHG16b, PrefetchW, and LAHF/SAHF capabilities.
    How do I find out if my processor supports these?

  2. #2
    WS Lounge VIP Browni's Avatar
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    Quote Originally Posted by access-mdb View Post
    Windows 10 system requirements (https://www.thurrott.com/windows/win...m-requirements) says this (amongst other things)


    How do I find out if my processor supports these?
    Coreinfo is the boy!

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    Those three were already required to run Windows 8.1 64-bit, so upgrading from that to Windows 10 64-bit must be OK:

    To install a 64-bit OS on a 64-bit PC, your processor needs to support CMPXCHG16b, PrefetchW, and LAHF/SAHF
    Windows 8.1 System requirements

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    Quote Originally Posted by Browni View Post
    Coreinfo is the boy!
    @access-mdb

    With coreinfo, PrefetchW and LAHF / SAHF are shown as such, CMPXCHG16b is shown under the CX16 entry.
    Rui
    -------
    R4

  5. #5
    Silver Lounger lumpy95's Avatar
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    How do I find out if my processor supports these?
    My newer computer (win 7 Pro sp1 64 bit) CPU supports it all but my older (win 7 Pro sp1 32 bit) only has SSE2 listed.

    From ZDnet:
    Download and run a handy utility called CPU-Z. Look under Instructions and if you seeSSE2, EM64T (indicates the processor has support for PAE) and either VT-d or VT-x(which is what's needed for NX support) then you're ready to rock.
    Last edited by lumpy95; 2015-06-01 at 14:54.

  6. #6
    WS Lounge VIP Browni's Avatar
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    Misleading info from ZDnet yet again!

    My old processor supported all of those mentioned but was still unable to upgrade to Windows 8.1.

    Brings back memories.

  7. #7
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    Quote Originally Posted by Browni View Post
    Misleading info from ZDnet yet again!

    My old processor supported all of those mentioned but was still unable to upgrade to Windows 8.1

    Brings back memories.
    The article discusses the CMPXCHG16b (and PrefetchW, and LAHF/SAHF) requirement for a 64-bit OS separately: Windows 10: What you need to run it
    Last edited by BruceR; 2015-06-01 at 15:42.

  8. #8
    Silver Lounger lumpy95's Avatar
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    Well, to be fair, they also mentioned this in the article which I believe is the problem you ran into.
    NX can be a pain in the behind because while your processor might support it, it could be disabled in the system BIOS, which then means having to dig around looking for the on switch.
    To install a 64-bit version of Windows 8.1 (not Windows 8) on a 64-bit PC, your processor also needs to support CMPXCHG16b (which also, annoyingly, needs motherboard support, so it can be hard to test for), PrefetchW, andLAHF/SAHF, which adds more confusion. Fortunately, most people will have this already.
    CPU-Z will only show PAE and NX support as far as I know.

    OOPs, sorry Bruce, I see you beat me to it.

  9. #9
    WS Lounge VIP Browni's Avatar
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    Bruce,

    I felt the pain back then and posted about in other threads as well I'm sure.

    Nothing like 1st hand experience of a problem eh?

  10. #10
    WS Lounge VIP access-mdb's Avatar
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    Goodness, what a lot of info! Looks like I have these as I've got Win 8.1 Pro and coreinfo confirms it

    Thanks one and all!

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