Taichi X399 U.2 PCIe x4 add-on card support£

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   Found the solution. I was able to boot into safe mode. Checked Device Manager. There was a device listed as "AMD RAID BOTTOM DEVICE" under storage controllers. I selected option to choose different driver, and there was one called "NVMe STANDARD". I chose that, rebooted normally fine. Issue resolved.

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WarpedTrekker Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 18 Jul 2018 Status: Offline Points: 76	Post Options Post Reply Quote WarpedTrekker Report Post Thanks(0) Quote Reply Topic: Taichi X399 U.2 PCIe x4 add-on card support£ Posted: 10 Jul 2022 at 11:39am
	Found the solution. I was able to boot into safe mode. Checked Device Manager. There was a device listed as "AMD RAID BOTTOM DEVICE" under storage controllers. I selected option to choose different driver, and there was one called "NVMe STANDARD". I chose that, rebooted normally fine. Issue resolved.

WarpedTrekker Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 18 Jul 2018 Status: Offline Points: 76	Post Options Post Reply Quote WarpedTrekker Report Post Thanks(0) Quote Reply Posted: 10 Jul 2022 at 8:47am
	I have a Kingston U.2 DC1000M SSD, and purchased a Startech x4 PCIe adapter card to plug the drive into. Then I installed the card into one of the x16 slots. The Kingston drive is detected in the BIOS. But Windows 11 fails to load and crashes, whenever the card is installed. I tried multiple slots and still Windows crashes. Windows boots fine without the card. Is there a BIOS setting I need to be changing when adding an x4 PCIe card like this? I have only one GPU in slot 1, and cards in slot 2 and 3. But none in slot 4 and 5. I tried changing Bifurcation to x4x4x4x4 and nothing helps.