AMD Motherboards - Multi Gpu setup on X670E PG Lightning

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Multi Gpu setup on X670E PG Lightning

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=27086
Printed Date: 27 Dec 2024 at 7:56am
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com

Topic: Multi Gpu setup on X670E PG Lightning

Posted By: Arashi0987
Subject: Multi Gpu setup on X670E PG Lightning
Date Posted: 15 Dec 2023 at 2:02pm

Hey I'm working on making an ubuntu server with 2 gpus but the second gpu is not detected by the nvidia drivers. Here are my current specs:

CPU: Ryzen 7950x
GPUs: 2x Aorus Xtreme RTX 3090 (in the 1st and 5th position PCIe slots)
MOBO: ASRock X670E PG Lightning
UEFI: X670E PG Lightning 2.02

My system boot into ubuntu just fine, but only detects one of the gpus. I've tried tweaking a couple values with the PCIe speeds to see if the OS would detect the second GPU but I had no luck.

Does anyone have any suggestions as to settings that I can tweak in the BIOS to get the 2nd GPU recognized? I feel like I'm probably overlooking import settings

Thanks
-Arashi

Replies:

Posted By: moshael
Date Posted: 08 Jan 2024 at 8:04pm

Were you able to solve your problem? Do both gpus work well?
I also have a problem with starting the second video card.
It looks like when the even one card is installed in PCIE3 (PCIe 4.0 x16, supports x4 mode), the network card became disabled.

Posted By: kakasho
Date Posted: 16 Feb 2024 at 8:40pm

Arashi0987 wrote:

GPUs: 2x Aorus Xtreme RTX 3090 (in the 1st and 5th position PCIe slots)
-Arashi

Did you mean PCIE1 and PCIE3? Because there are no PCIE5 on the X670e PG lightning.

I am also having the same setup. Did anyone manage to solve it?

Posted By: kakasho
Date Posted: 16 Feb 2024 at 9:05pm

moshael wrote:

Were you able to solve your problem? Do both gpus work well?
I also have a problem with starting the second video card.
It looks like when the even one card is installed in PCIE3 (PCIe 4.0 x16, supports x4 mode), the network card became disabled.

After going over the manual, theoretically a dual setup should work (manual page 31).

PCIe slots:
PCIE1 (PCIe 5.0 x16 slot) is used for PCIe x16 lane width graphics cards.
PCIE2 (PCIe 4.0 x1 slot) is used for PCIe x1 lane width cards.
PCIE3 (PCIe 4.0 x16 slot) is used for PCIe x4 lane width graphics cards.
PCIE4 (PCIe 4.0 x16 slot) is used for PCIe x1 lane width cards

The table at the bottom of page 31 specifies that a dual setup is possible with PCIE1 Gen5x16 and PCIE3 Gen4x4. They do list that the dual configuration is set up with Two Graphics Cards in
CrossFireTM Mode. I am not sure if that is a requirement.

Does that mean the dual setup only works with AMD graphic cards?