Windows 10: KB4100347 Intel microcode updates for Windows 10 v1803 - September 13

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  1. Cliff S's Avatar
    Posts : 21,661
    Win10 Pro, Win10 Pro N, Win10 Home, Win10 Pro Insider Fast Ring, Windows 8.1 Pro, Ubuntu
       22 Aug 2018 #150

    Oh well no real change in latency in my case anyhow.
    All within tolerance.
    Click image for larger version. 

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  2.    22 Aug 2018 #151

    Has there been been a statement from Microsoft about why Windows Update is installing KB4100347 on seemingly all computers regardless if it's necessary or even applicable?
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  3. ThrashZone's Avatar
    Posts : 3,831
    3-Win-7Prox64 2-Win10Prox64
       22 Aug 2018 #152

    Hi,
    MS micro code madness month
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  4.    22 Aug 2018 #153

    Cliff S said: View Post
    Kinda of dumb(redundant) to have something running in memory the whole time, when BIOS already is taking care of it.

    I have enough memory, but, others sure don't.
    What is running in memory?
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  5.    22 Aug 2018 #154

    andyouf said: View Post
    What is running in memory?
    Please look at that post
    The Microsoft provided microcode runs in RAM.
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  6. Bree's Avatar
    Posts : 8,809
    10 Home x64 (1809) (10 Pro on 2nd pc)
       22 Aug 2018 #155

    ddelo said: View Post
    Please look at that post
    The Microsoft provided microcode runs in RAM.
    Yes, it does, but the particular RAM in question isn't your PC's normal RAM, it is a small bit of RAM inside the CPU called the 'Writable Control Store' (WCS). And it is always stored and run from the CPU's WCS regardless of how it got written there, by the BIOS at POST or a .dll during OS boot up. The end result is identical, the microcode is inside the CPU.

    Starting with the Pentium Pro in 1995, several Intel x86 CPUs have writable microcode.[26][27] This, for example, has allowed bugs in the Intel Core 2 and Intel Xeon microcodes to be fixed by patching their microprograms, rather than requiring the entire chips to be replaced. A second prominent example is the set of microcode patches that Intel offered for improving the capabilities of processor architectures of up to nearly 10 years in age in the progress of counter fighting the serious Spectre and Meltdown security dangers as went really public in start of 2018.[28][29] A microcode update can be installed by Linux,[30] FreeBSD,[31] Microsoft Windows,[32] or the motherboard BIOS.[33]
    Microcode - Wikipedia
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  7.    22 Aug 2018 #156

    Bree said: View Post
    Yes, it does, but the particular RAM in question isn't your PC's normal RAM, it is a small bit of RAM inside the CPU called the 'Writable Control Store' (WCS). And it is always stored and run from the CPU's WCS regardless of how it got written there, by the BIOS at POST or a .dll during OS boot up. The end result is identical, the microcode is inside the CPU.

    Microcode - Wikipedia
    Thanks @Bree
    Excellent technical explanation!
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  8. ThrashZone's Avatar
    Posts : 3,831
    3-Win-7Prox64 2-Win10Prox64
       22 Aug 2018 #157

    Hi,
    System reserved ?
    Oops wrong term hardware reserved ?
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  9.    22 Aug 2018 #158

    It now appears that KB4100347 wasn't actually updated. The Microsoft support web page associated with KB4100347 (which can be found in the first post) no longer says it was updated on 8/21; it has (at least for now) gone back to saying that it was last updated on 7/24.
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  10. Bree's Avatar
    Posts : 8,809
    10 Home x64 (1809) (10 Pro on 2nd pc)
       22 Aug 2018 #159

    Ground Sloth said: View Post
    It now appears that KB4100347 wasn't actually updated. The Microsoft support web page associated with KB4100347 (which can be found in the first post) no longer says it was updated on 8/21; it has (at least for now) gone back to saying that it was last updated on 7/24.
    That would explain why one of my machines got the 8/21 version just now, but checking for updates on the other didn't see it as required. That one had already had the 7/74 one previously.
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