X99 Taichi PCI-E Bifurcation?
Printed From: ASRock.com
Category: Technical Support
Forum Name: Intel Motherboards
Forum Description: Question about ASRock Intel Motherboards
URL: https://forum.asrock.com/forum_posts.asp?TID=12640
Printed Date: 05 Aug 2025 at 10:13am
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com
Topic: X99 Taichi PCI-E Bifurcation?
Posted By: shadowmustic
Subject: X99 Taichi PCI-E Bifurcation?
Date Posted: 11 Oct 2019 at 8:12am
Hello,
I recently upgraded to 2 new NVMe drives that are working well. The previous drives still work fine for other use cases, so I got a PCI-E NVMe expansion card, but it can only access 1 of the drives.
Forum research suggests that this is because the card would need 4X/4X/4X/4X PCI-E bifurcation to see the drives individually. Is it possible to enable this? If so, is there a BIOS version available for the X99 Taichi that supports PCI-E bifurcation?
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Replies:
Posted By: badbri
Date Posted: 14 Oct 2019 at 3:23am
from Asrock_TSD "About PCI-E bifurcation, Intel 300 series only supports x16 to x8x8. Four x4 only support at HEDT like x299 chipset."
So NO you cannot do 4x/4x/4x/4x with x99 chipset and is why only one drive is seen. If the adapter did 8x/8x then it might work.
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https://www.passmark.com/baselines/V9/display.php?id=99573335296
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Posted By: shadowmustic
Date Posted: 15 Oct 2019 at 2:22am
That is unfortunate but understandable if it is a limitation of the platform.
The problem would still be that the BIOS on my board doesn't even have the option for x8/x8 which should at least allow 2/3 drives to be visible.
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