AMD Motherboards - B450 Pro4 running GPU at x8, not x16

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B450 Pro4 running GPU at x8, not 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=18433
Printed Date: 20 May 2024 at 7:46am
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com

Topic: B450 Pro4 running GPU at x8, not x16

Posted By: Vulpie05
Subject: B450 Pro4 running GPU at x8, not x16
Date Posted: 22 Mar 2021 at 4:07am

Hi-

I've been running my B450 Pro4 for a few years with no problems. I had a 2200G APU and a 1660 Ti GPU. The GPU would run at x8 PCIe link speed, as advertised, because of the Raven Ridge APU.

The other day I upgraded the 2200G to a 2700, and the PCIe link speed is still at x8. I have cleared CMOS, reinstalled my NVIDIA driver, and ran DDU for the old AMD drivers. Still runs at x8.

What am I missing here£ I don't have any other PCIe slots filled, nor any M.2 drives (I'm using 2 sata drives, though).

Any help would be appreciated, thank you!

Replies:

Posted By: muziqaz
Date Posted: 22 Mar 2021 at 9:03pm

X8 is still plenty for the GPU. For reference I run my 6900xt at x8, and see no performance issues.
In order to get x16n working, there is BIOS setting which let's you select PCI-e link speed.

Since Asrock did not bother adding English Manual in their support page, I cannot tell you exactly where that setting is

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