B450 Pro4 running GPU at x8, not x16

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   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!

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Vulpie05 Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 26 Dec 2018 Status: Offline Points: 64	Post Options Post Reply Quote Vulpie05 Report Post Thanks(0) Quote Reply Topic: B450 Pro4 running GPU at x8, not x16 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!

muziqaz Members Profile Send Private Message Find Members Posts Add to Buddy List Groupie Joined: 04 Jan 2021 Location: London Status: Offline Points: 590	Post Options Post Reply Quote muziqaz Report Post Thanks(0) Quote Reply 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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