B650E Steel Legend PCIe 4.0 x8 instead of x16
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=25534
Printed Date: 04 May 2024 at 3:41pm
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com
Topic: B650E Steel Legend PCIe 4.0 x8 instead of x16
Posted By: Senac
Subject: B650E Steel Legend PCIe 4.0 x8 instead of x16
Date Posted: 27 Feb 2023 at 5:32pm
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Hi. I have a question. On the B650E Steel Legend board, are the PCIe Gen5 lines for the top PCIe 5 x16 slot shared with the Blazing M.2 socket (M2_1, Key M). Currently, I have a GPU connected to PCIE1 and a bootable NVMe drive connected to the Blazing M.2 socket. For the GPU, I have PCIe 4.0 set to x8 instead of x16.
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Replies:
Posted By: eccential
Date Posted: 27 Feb 2023 at 8:01pm
No. AM5 CPU has 28 lanes, 4 of which are used to connect to the chipset.
16 lanes to PCIe slot1
4 lanes to PCIe slot2
4 lanes to M2_1
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24 total
And 4 more to the chipset, as mentioned already.
What GPU? Some lower end GPUs only have 8 lanes, like RX-6600*, RX-5500*, RTX-3050, etc. But there was another thread talking about the same issue. Some fixed with reseating the CPU, another fixed with a replacement CPU. I don't remember if there was other solutions.
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Posted By: Senac
Date Posted: 27 Feb 2023 at 8:15pm
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RX-6800XT. Thank you for your reply. So one possibility is already ruled out. I will try reseating the GPU and CPU.
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Posted By: Senac
Date Posted: 28 Feb 2023 at 1:19am
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Looks like the problem is solved, reseating the GPU helped. It was apparently not pressed down enough before.
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Posted By: eccential
Date Posted: 28 Feb 2023 at 3:45am
Good to hear. These modern connectors are doing a lot, because the signal rate is so high. I also had a problem some months ago where cleaning the connector contacts with alcohol fixed it. I'm much more careful about not touching any exposed contacts these days.
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