When PCIe x16 is set to Gen 4, system doesn't boot
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=27201
Printed Date: 21 Dec 2024 at 10:17pm
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com
Topic: When PCIe x16 is set to Gen 4, system doesn't boot
Posted By: iscottjs
Subject: When PCIe x16 is set to Gen 4, system doesn't boot
Date Posted: 29 Dec 2023 at 2:34am
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System power cycles when PCIe x16 link speed in the bios is set to either Auto or Gen 4, forcing it to Gen 3 is the only way to get stability but not sure why or if this is hiding more serious issues (RTX 4070 Ti, ASRock B650M, 7800X3D). This is a brand new build, everything was running stable until I connected the GPU. After switching the display to the HDMI port on the GPU, the system boots into Windows just fine for the first time but as soon as the Nvidia drivers are installing the system becomes unusable. The system hard resets during driver installation and continues to power cycle after that. It sometimes does manage to boot into Windows but after 30 seconds on the desktop it will lock up and reset. After doing some research, I've found many people with similar issues with similar systems. What I've changed that has worked: - Force PCIe x16 link speed in the bios to Gen 3 instead of Auto or Gen 4. - Setting "Power management mode" to "Prefer maximum performance" in the Nvidia control panel. - Uninstalling and reinstalling drivers in safe mode using DDU. Since making these changes, the system is so far running stable and I'm able to run MSFS in VR and 3DMark without any issues. What I've tried that didn't make a difference (when in PCIe Gen 4 or Auto mode): - Re-seating the GPU and memory, multiple times. - Re-installing Windows, multiple times. - Using 2x PCIe cables from the PSU instead of sharing a single cable (as per instructions). - Flashing motherboard bios (was on 1.28, now on 2.02). - Upgrading or downgrading Nvidia drivers (tried the latest 546.33 and the older 537.xx drivers). - Tried different cables, ports (HDMI and DisplayPort) and monitors. - Disconnecting non-essential components, e.g. WiFi adapter, games controllers, etc. - Monitoring all temperatures (they're all fine). - Resetting CMOS. Notes about my setup: - GPU is installed in the top slot (PCIE1). - Samsung 2TB M.2 NVMe PCIe 4.0 drive is installed in the primary M.2 slot with heatsink (M.2_1). - GPU is connected using the supplied Y-splitter and two separate PCIe cables from the PSU. Setup diagram: https://imgur.com/a/foW1kG9" rel="nofollow - https://imgur.com/a/foW1kG9 Photo of BIOS: https://imgur.com/a/XGVAMtd" rel="nofollow - https://imgur.com/a/XGVAMtd Questions: - Should I be worried that this workaround is hiding more serious hardware/software/compatibility issues that I shouldn't ignore and might bite me later? - Would this be a motherboard or GPU issue or something else? I'm not sure who to contact for support. - I'm no expert with modern PCIe, could the M.2 NVMe drive be taking resource priority away from the GPU and causing it to crash? Any useful bios settings that might help? - Is this just a software issue? Could this issue fix itself as new software/firmware/drivers are released? - Anything else I should try? What I find interesting is that the machine will boot stable in Gen 4 when changing it from Gen 3, but I will only get one stable session out of it, if the machine is powered off/on while still in Gen 4 mode then it won't boot again until I change it back to Gen 3. I'm not sure how relevant that is but it seems strange. If this is normal and I just need to use Gen 3 going forward then fine, but I don't like the idea of keeping potentially faulty or incompatible hardware for the lifespan of this machine. I already have another unboxed ASRock Pro RS board (I ordered 2 by accident) and need to return it to Amazon, but I am tempted to swap the motherboards to see if it fixes it, but if it turns out it's not a motherboard issue then I'm worried I might have issues returning it once opened. What should I do? Thanks, Scott. |
Replies:
Posted By: iscottjs
Date Posted: 29 Dec 2023 at 2:38am
| Full PC specs at the bottom of this post: https://www.reddit.com/r/buildapc/comments/18sv2ch/new_build_power_cycles_when_pcie_x16_link_speed/" rel="nofollow - https://www.reddit.com/r/buildapc/comments/18sv2ch/new_build_power_cycles_when_pcie_x16_link_speed/ |
Posted By: punq74
Date Posted: 07 Jan 2024 at 6:20pm
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Hi, i have exwactly the same issues with my setup. - B650m Pro RS Wifi (2.02 BIOS) - AMD Ryzen 5 7600 - AMD RX6800 nonXT - 32 GB Corsair Vengeance Mem AMD Expo) And had the same issue with my old GTX1060 6GB GPU. I have tried a lot of things, reseat CPU, GPU/PCIE cleaning and reseating etc.. I'm beginning to suspect i has to do with bandwidth maybe. I can force mine to work with pcie gen4 @ x8 (8GT/s) And you've succesfully gotten pcie x16 in Gen3 (whick is also 8GT/s) I have created an RMA to my local supplier, but i suspect that this is more a BIOS/UEFI issue than a hardware issue. But the 2 times i've reached out to asrock i have just gotten screendump back, where they have succesfully run the same CPU/GPU combo at full gen4 pciex16 speed... |
Posted By: punq74
Date Posted: 07 Jan 2024 at 6:22pm
| I have also experienced that i can get 1 stable session in gen4 pciex16 mode, but only if i "hot" boot into UEFI and change it. NJext powercycle it wont work again. |
Posted By: K9PT
Date Posted: 08 Jun 2024 at 1:40am
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GTX1XXX need update on gpu bios...search on Google |
Posted By: eccential
Date Posted: 09 Jun 2024 at 7:21pm
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Might be a long shot, but try cleaning the GPU's PCIe connector with CRC Electronics Cleaner, or just alcohol. The other side of the PCIe connection is of course the CPU pads. I assume you never touched the contact pads on the CPU. |
Posted By: Dobw
Date Posted: 25 Sep 2024 at 2:44am
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Did anyone ever get any further on this? Running into the exact same thing. Started a 2nd thread here but figured I'd check in on this thread if anyone have a light bulb moment or found something new: https://forum.asrock.com/forum_posts.asp?TID=67762&PID=151169𤺁" rel="nofollow - https://forum.asrock.com/forum_posts.asp?TID=67762&PID=151169𤺁 |
Posted By: NDRE28
Date Posted: 26 Sep 2024 at 12:13pm
Hello! Please try the following: 1. Set PCIe x16 Link Speed: Gen4 2. Set M.2_1 Link Speed: Gen4 3. Save (F10) / Reboot |
iscottjs wrote:Posted By: NDRE28
Date Posted: 26 Sep 2024 at 12:15pm
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Hello! Please try the following: 1. Set PCIe x16 Link Speed: Gen4 2. Set M.2_1 Link Speed: Gen4 3. Save (F10) / Reboot |
Posted By: Dobw
Date Posted: 26 Sep 2024 at 8:57pm
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No difference when setting both the PCIe x16 Link Speed and M.2_1 Link Speed to Gen4. System boots but unable to use mouse or keyboard without a 2 or 3 second delay. Stutter / Visual Artifacting / Laggy. Flipping PCIe x16 Link Speed back to Gen3 and it all works flawlessly. Happy to test any other ideas as I'm not sure what else to try. |
Posted By: NDRE28
Date Posted: 26 Sep 2024 at 9:31pm
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Hello! In this case, I'd contact the ASRock Support Center. They might send you a special BIOS file that solves the issue. (For that, you should go on the web page of your motherboard). NOTE: You'll have to give them the serial number of your motherboard. |
Posted By: NDRE28
Date Posted: 03 Oct 2024 at 2:36pm
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There are some problems on the AM5 platform, besides the issue that was mentioned here. There is also a bug in the Zen 5 microarchitecture that prevents program activations through iLok License Manager too. About the second issue, AMD stated that they are working on a new firmware: AGESA 1.2.0.2A, which should come out in early november 2024. Maybe that firmware update will solve both issues. |
Posted By: NDRE28
Date Posted: 12 Oct 2024 at 3:49pm
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Hello! I have upgraded my PC with a Gigabyte RTX 3080 OC Vision 10G video card (PCIe 4.0 x16). I've updated the firmware of the GPU to the latest BIOS version (F31), in order to have Resizable BAR support. In the BIOS of my X670E Taichi motherboard, I have set the PCIe x16 Link speed at: Gen4. However, my system runs without issues. (I have benchmarked it extensively). Maybe, those who have stability issues after setting the PCIe x16 Link speed at Gen4, didn't update the firmware of their GPU, or the BIOS of their motherboard? |
Posted By: buzzftw
Date Posted: 01 Nov 2024 at 7:42pm
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So any update on this? Facing this same thing. RMA'd the GPU, then sent it back today saying its fine. I haven't yet tried to force gen 3 on it. I read somewhere that we require a firmware update on the GPU (4080S in my case). I have an old 1070 runs fine on Auto in BIOs. https://www.nvidia.com/content/DriverDownloads/confirmation.php?url=/Windows/uefi/firmware/1.2/NVIDIA_UEFI_Firmware_Updater_1.2-x64.exe&firmware=1&lang=us&type=Other" rel="nofollow - https://www.nvidia.com/content/DriverDownloads/confirmation.php?url=/Windows/uefi/firmware/1.2/NVIDIA_UEFI_Firmware_Updater_1.2-x64.exe&firmware=1&lang=us&type=Other |
Posted By: NDRE28
Date Posted: 03 Nov 2024 at 10:39pm
Hello! If there's a firmware update for your video card, I'd suggest installing it. Then set the correct PCIe lane speed for your x16 slot and for your M.2_1 slot. |