X470D4U with PCIe GPU
Printed From: ASRock.com
Category: Technical Support
Forum Name: AMD Motherboards
Forum Description: Question about ASRock AMD motherboards
URL: https://forum.asrock.com/forum_posts.asp?TID=12812
Printed Date: 19 Apr 2024 at 8:18pm
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com
Topic: X470D4U with PCIe GPU
Posted By: cgbspender
Subject: X470D4U with PCIe GPU
Date Posted: 04 Nov 2019 at 8:26pm
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As soon as I add a graphics card to the X470D4U it is automatically selected as "primary video adaptor" and the remote KVM no longer gets a signal. The option is in the BIOS under "AMD PBS", but it can not be selected or changed. It looks like aspeed BMC GPU is automatically disabled. Does anyone know a way to bring it back and set it as primary? Other mainboards allow to select the primary graphics in this case so the remote kvm is still usable and the OS can handle both (or all) graphics cards. Without the KVM I could have bought a much cheaper board. 
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Replies:
Posted By: FLPPasRock
Date Posted: 04 Nov 2019 at 9:31pm
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I've been using it with a Radeon Pro WX 4100 GPU in the small PCIe 3.0 x4 slot. Go to BIOS -> Advanced -> Chipset and change the Onboard VGA setting from Auto to Enabled, this way at least the dGPU won't disable the onboard VGA. If this doesn't help you might also try chsnging the boot mode to UEFI only with CSM disabled, if possible. Changing these two options lets me use both GPUs, at least in Windows 10, don't know about other operating systems. I quite like the X470D4U's theoretical hardware capabilities but the BIOS and BMC software state is unfortunately a mess (compare large Level1Techs thread where various X470D4U users help each other out since ASRock Rack's support is a "little bit" "understaffed" regarding this motherboard model) |
Posted By: cgbspender
Date Posted: 04 Nov 2019 at 10:31pm
Thank you very much. Must have missed that option. Will try it when I get home. 
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Posted By: FLPPasRock
Date Posted: 04 Nov 2019 at 11:52pm
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Hope that the options mentioned are going to help you! But it doesn't solve the issue that the user cannot change the greyed-out setting specifying what GPU should be used as the primary output device :( Level1Techs is a rather niche tech YouTube channel that recently assisted Gamer's Nexus (another YouTube channel) with the build of a NAS with the ASRock Rack X470D4U2-2T (the same as the X40D4U but with dual 10 GbE onboard): https://www.youtube.com/watch?v=Hix0l8cFaMw The large Level1Techs forum thread I mentioned where X470D4U users help each other out is: https://forum.level1techs.com/t/asrock-rack-has-created-the-first-am4-socket-server-board/139490 |
Posted By: starkruzr
Date Posted: 17 May 2020 at 12:28pm
| Has anyone else noticed that regardless of whether the GPU is set as primary it just... doesn't show up in Linux? At all? Like not even in lspci, or in the system inventory in IPMI? I have had this problem both with an AMD GPU with an external power source and an NVidia GPU with just PCIe as the power source. The fans spin, but it's like there's no communication. Both of these cards have been confirmed to work on other machines. |
Posted By: Twalks
Date Posted: 07 Sep 2020 at 7:32am
| I've had the same issue @starkruzr with my smaller gpu (asus b750pi), had to rip out the 980ti from a different build to get it to boot properly. Having to order a smaller, modern gpu because the massive 980 wont fit in the Silverstone case... |
Posted By: mrfreitag
Date Posted: 08 Dec 2020 at 5:23am
| I also had the same problem, setting the PCIE to 2x8 instead of 1x16 solved it for me. Does not seem to affect the performance, though: https://www.gamersnexus.net/guides/2488-pci-e-3-x8-vs-x16-performance-impact-on-gpus |
Posted By: lliax
Date Posted: 18 Jan 2021 at 11:26pm
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Unfortunately, the card s7150x2 doesn't work with virtualization enabled (SR-IOV enabled). BIOS post: dxe pci bus enumeration I bought a processor 3900X, 128GB RAM for this motherboard. And it turned out that in vain! I will put s7150x2 in the working Intel server based on Supermicro and double Xeon E5-2667v2. For reference, I confirm that the built-in and external video cards are launched simultaneously when the option is enabled: BIOS -> Advanced -> Chipset and change the Onboard VGA setting from Auto to Enabled, this way at least the dGPU won't disable the onboard VGA |
Posted By: lliax
Date Posted: 19 Jan 2021 at 2:14am
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I'm sorry, the video card started with the correct settings. Mount videocard in to PCIe slot nuber 6! (16 lanes PCIe) Default Bios 3.50 Enabled: 1. ADVANCED: 1.1. Chipset Configuration: onboard vga abode 4G deocding sr-iov 1.2. AMD CBS -> NBIO Common Opions: IOMMU ACS Support PCIe ARI Support PCIe ARI Enumeration PCIe Teb Bit Tag Support PCIe ARI Support 2. Boot: CSM -> UEFI only for launch video and other storage, PCIe6 - uefi |
Posted By: NoHTTPS?
Date Posted: 31 Jul 2021 at 7:44pm
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you just saved me a whole lot of headache! thanks brother |
Posted By: lliax
Date Posted: 29 Sep 2021 at 1:29am
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The BIOS settings from my post above relate primarily to the mxgpu mode setting for the AMD S7150 video card. I installed Windows today and established the following fact. Integrated graphics work with artifacts when running windows from the legacy disk. Including I was unable to put the drivers for the video card in the pci slot. In windows startup mode from a UEFI disk, the integrated graphics start and the drivers are installed normally. |
Posted By: lliax
Date Posted: 29 Sep 2021 at 5:39am
| Addition. I managed to start the GPU S7150 normally at Windows 10, but I can't do it in Windows Server 2019. On the same computer, with exactly the same settings. Maybe it's not about the drive startup modes. Maybe in win Server 2019 turned off support for earlier video cards. |
Posted By: igorekDE
Date Posted: 20 Sep 2022 at 10:43am
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hello, i updated bios to 4.20 then to 4.26 after that, my choice of primary graphics adapter is also inactive in bios 3.50 What do i do? |