x470 Taichi PCIe bifurcation problem
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=101347
Printed Date: 18 Mar 2025 at 11:59pm
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com
Topic: x470 Taichi PCIe bifurcation problem
Posted By: aswin
Subject: x470 Taichi PCIe bifurcation problem
Date Posted: 17 Mar 2025 at 10:11pm
Hello,
I am experiencing an issue with the PCIe bifurcation (PCIe x16 switch) feature after updating the BIOS beyond version 5.10. My current configuration is as follows:
PCIe Slot 1: GPU installed.
PCIe Slot 3: Uses a PCIe-to-U.2 converter to support two NVMe U.2 SSDs.
PCIe Slots 2, 4, and 5: Each occupied by an SSD.
M.2_M1 Port: NVMe SSD installed.
With BIOS version 5.10 and earlier (including 4.xx), all SSDs are recognized correctly using PCIe bifurcation in an x8/x4/x4 configuration. However, in BIOS versions 8.xx and 10.xx:
When PCIe bifurcation (PCIe x16 switch) is enabled, the NVMe SSD in PCIe Slot 4 is not recognized.
When I disable PCIe bifurcation (by setting it to x16 mode), the NVMe SSD in PCIe Slot 4 is recognized, but the two U.2 SSDs in PCIe Slot 3 (via the PCIe-to-U.2 converter) are not recognized.
This issue does not occur in BIOS 5.10 and earlier.Any idea?
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Replies:
Posted By: NDRE28
Date Posted: 18 Mar 2025 at 2:19am
Hi!
I'd downgrade the BIOS version to the one that worked well (v5.10).
Sometimes, new BIOS versions are worst, in some areas, than the old ones.
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Posted By: eccential
Date Posted: 18 Mar 2025 at 4:40am
Sounds like BIOS bug. You should contact AsRock tech support for that.
In the mean time, you can stay at 5.10 as NDRE28 suggested.
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