https://forum.asrock.com/ Copyright (c) 2006-2013 Web Wiz Forums - All Rights Reserved. Sun, 19 Apr 2026 01:54:47 +0000 Wed, 01 Sep 2021 18:13:06 +0000 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 12.04 360 https://forum.asrock.com/RSS_post_feed.asp?TID=19501 https://forum.asrock.com/forum_images/web_wiz_forums_black.png https://forum.asrock.com/ https://forum.asrock.com/forum_posts.asp?TID=19501&PID=89981&title=x399-taichi-no-boot-with-bifurication-on-4x4x4x4#89981 Author: smoothrun
Subject: 19501
Posted: 01 Sep 2021 at 6:13pm

it stops at post code 94 fwiw]]> Wed, 01 Sep 2021 18:13:06 +0000 https://forum.asrock.com/forum_posts.asp?TID=19501&PID=89981&title=x399-taichi-no-boot-with-bifurication-on-4x4x4x4#89981 https://forum.asrock.com/forum_posts.asp?TID=19501&PID=89980&title=x399-taichi-no-boot-with-bifurication-on-4x4x4x4#89980 Author: smoothrun
Subject: 19501
Posted: 01 Sep 2021 at 6:12pm

MB: x399 taichi bios 3.90 and 3.50 tested.
cpu tr 1950x

So i have a pcie splitter card connected to 4 U.2 nvme disks. both confirmed working on another amd system with bifurication 4x4x4x4 on.
but on my x399 taichi i connect it to the pcie 4 slot(set to 4x4x4x4 mode), and as soon as i have more than 1 nvme connected to the slot it halts at boot code 94.
if i disconnect all but one of the nvme drives it boots fine.
so far ive tested turning iommu on/off.
pcie1 has a 16x gpu
pcie2 has a 4x card working fine
pcie4 has the pcie16x to 4x u.2 plugs only works with 1 nvme connected.
pcie5 has a 4x card working fine.

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