IMPORTANT WINDOWS 10 INFORMATION FOR X399 USERS

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   If you are installing Windows 10 on an ASRock X399 board, please read this information to potentially save yourself from your new installation failing to boot for no apparent reason.

If your version of Windows 10 is 1607 (RS1) or earlier, please set the IOMMU option to Disabled in the UEFI/BIOS before you try to install Windows 10. The IOMMU option is in the Advanced\North Bridge Configuration screen. The default value of Auto for this option is Enabled. Don't forget if you do a UEFI/BIOS clear, the IOMMU feature will be reset to Auto/enabled. You'll need to reset it to Disabled if you want to use a Windows 10 RS1 version.

If the IOMMU option is enabled in the UEFI, after installing Windows 10 RS1, the PC will begin loading Windows, but freeze at that point. That is caused by the Windows 10 RS1 versions not supporting the IOMMU feature.

Windows 10 RS2 versions support the X399/ThreadRipper IOMMU feature, so won't have this issue after the installation. 

If you have an older Windows 10 disk or ISO download USB installer, please go to the Microsoft page below, and use their Media Creation tool to download the latest version of Windows 10. When you run this tool, please be sure to select the Create installation media (USB flash drive, DVD, or ISO file) for another PC option. You can then select the creation of a USB flash drive installation media, or saving the download as an ISO file. You may use the license key from an older Windows 10 optical disk, etc, to activate the new version of Windows 10 downloaded with the media creation tool.

[URL=https://www.microsoft.com/en-us/software-download/windows10]https://www.microsoft.com/en-us/software-download/windows10[/URL]

The issue with early versions of Windows 10 not supporting the X399/ThreadRipper IOMMU feature is also true for Windows 7, 8, and 8.1. While those versions of Windows are not officially supported by the X399/ThreadRipper platform (for other reasons), if you choose to use any of those versions of Windows, you also should (must) disable the IOMMU feature in the UEFI/BIOS.

Users of other OS types, such a Linux, should disable the IOMMU feature if you are unsure that the OS or version of that OS supports the X399/ThreadRipper IOMMU feature.

Edited by Xaltar - 02 Jan 2020 at 4:11pm

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parsec Members Profile Send Private Message Find Members Posts Add to Buddy List Moderator Group Joined: 04 May 2015 Location: USA Status: Offline Points: 4996	Post Options Post Reply Quote parsec Report Post Thanks(0) Quote Reply Topic: IMPORTANT WINDOWS 10 INFORMATION FOR X399 USERS Posted: 17 Nov 2017 at 12:12pm
	If you are installing Windows 10 on an ASRock X399 board, please read this information to potentially save yourself from your new installation failing to boot for no apparent reason. If your version of Windows 10 is 1607 (RS1) or earlier, please set the IOMMU option to Disabled in the UEFI/BIOS before you try to install Windows 10. The IOMMU option is in the Advanced\North Bridge Configuration screen. The default value of Auto for this option is Enabled. Don't forget if you do a UEFI/BIOS clear, the IOMMU feature will be reset to Auto/enabled. You'll need to reset it to Disabled if you want to use a Windows 10 RS1 version. If the IOMMU option is enabled in the UEFI, after installing Windows 10 RS1, the PC will begin loading Windows, but freeze at that point. That is caused by the Windows 10 RS1 versions not supporting the IOMMU feature. Windows 10 RS2 versions support the X399/ThreadRipper IOMMU feature, so won't have this issue after the installation. If you have an older Windows 10 disk or ISO download USB installer, please go to the Microsoft page below, and use their Media Creation tool to download the latest version of Windows 10. When you run this tool, please be sure to select the Create installation media (USB flash drive, DVD, or ISO file) for another PC option. You can then select the creation of a USB flash drive installation media, or saving the download as an ISO file. You may use the license key from an older Windows 10 optical disk, etc, to activate the new version of Windows 10 downloaded with the media creation tool. [URL=https://www.microsoft.com/en-us/software-download/windows10]https://www.microsoft.com/en-us/software-download/windows10[/URL] The issue with early versions of Windows 10 not supporting the X399/ThreadRipper IOMMU feature is also true for Windows 7, 8, and 8.1. While those versions of Windows are not officially supported by the X399/ThreadRipper platform (for other reasons), if you choose to use any of those versions of Windows, you also should (must) disable the IOMMU feature in the UEFI/BIOS. Users of other OS types, such a Linux, should disable the IOMMU feature if you are unsure that the OS or version of that OS supports the X399/ThreadRipper IOMMU feature. Edited by Xaltar - 02 Jan 2020 at 4:11pm


HappyChubb Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 17 Jan 2018 Location: USA Status: Offline Points: 1	Post Options Post Reply Quote HappyChubb Report Post Thanks(0) Quote Reply Posted: 17 Jan 2018 at 2:32pm
	My experience precisely. Appreciate your thorough assessment of this issue. Additionally, I had to disable the CMS setting (bottom selection under "Boot" tab) in order to get Windows to boot & load properly. All BIOS settings returned to their defaults after flashing the BIOS, so I had to manually disable these settings again. Great advice, parsec.

ljdiaz91 Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 09 Oct 2019 Location: United States Status: Offline Points: 9	Post Options Post Reply Quote ljdiaz91 Report Post Thanks(0) Quote Reply Posted: 11 Oct 2019 at 3:31pm
	Quick question. Would this cause a corruption in the install if it crashes during install? I've been having problems with my machine using windows 10 and it crashes during install but then when I reload it goes into the normal setup of windows 10. I'm really close to giving up on my machine I've had so many problems with it :\

Tearsmiles Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 14 Oct 2019 Location: London Status: Offline Points: 2	Post Options Post Reply Quote Tearsmiles Report Post Thanks(0) Quote Reply Posted: 14 Oct 2019 at 4:55pm
	Whether it's creating a bootable USB or upgrading your computer,you need to be careful.

Tearsmiles Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 14 Oct 2019 Location: London Status: Offline Points: 2	Post Options Post Reply Quote Tearsmiles Report Post Thanks(0) Quote Reply Posted: 16 Oct 2019 at 1:56pm
	About creating Windows 10 installation media tool. https://www.uubyte.com/iso-editor.html As well as you can do it like this. https://www.microsoft.com/en-gb/software-download/windows10

Dcmegacab Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 09 Nov 2019 Status: Offline Points: 55	Post Options Post Reply Quote Dcmegacab Report Post Thanks(0) Quote Reply Posted: 09 Nov 2019 at 12:31pm
	I just bought my X399, is windows 10 version 1809 released in March 2018 is that new enough to not give me problems with install? what is RS1 exactly?

Xaltar Members Profile Send Private Message Find Members Posts Add to Buddy List Moderator Group Joined: 16 May 2015 Location: Europe Status: Offline Points: 26118	Post Options Post Reply Quote Xaltar Report Post Thanks(0) Quote Reply Posted: 09 Nov 2019 at 4:57pm
	If you download and install the latest installation medium from Microsoft you will not have any problems. Even the version you mentioned should be fine but as a matter of course I always grab the latest from MS when I do a fresh installation, it saves updating time and avoids potential compatibility issues.


Dcmegacab Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 09 Nov 2019 Status: Offline Points: 55	Post Options Post Reply Quote Dcmegacab Report Post Thanks(0) Quote Reply Posted: 09 Nov 2019 at 6:24pm
	Ok I see. If I purchase and download a fresh updated win 10 install and transfer it onto a USB memory key is there anything I need to format first or will the win 10 download be good to go, say if I make the purchase directly from the Microsoft website.

rewtdawg Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 29 Nov 2019 Status: Offline Points: 6	Post Options Post Reply Quote rewtdawg Report Post Thanks(0) Quote Reply Posted: 30 Nov 2019 at 12:00am
	If anyone is having random lockups when the x399/threadripper 2 is idle, it seems to be because the CPU voltage drops too low and locks up. I just applied a manual OC @ 3.5ghz with 1.15 volts and it has been stable for 24 hrs.