X670E Taichi bifurcation question
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=25693
Printed Date: 18 Jul 2025 at 5:28am
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com
Topic: X670E Taichi bifurcation question
Posted By: meekrophone
Subject: X670E Taichi bifurcation question
Date Posted: 03 Apr 2023 at 5:17am
Greetings,
planning on getting a Taichi. Need to know some detail about the bifurcation settings in the BIOS related to the PCIe slots. One of the settings is [8x4x4x].
- Does this setting mean that the whole first slot gets split up into 8x4x4x? (leading to a deactivated 2nd slot)
- Or does it mean the first slot becomes an 8x slot and the 2nd slot becomes as 4x4x slot?
Any info on this would be appreciated
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Replies:
Posted By: eccential
Date Posted: 03 Apr 2023 at 6:13pm
Bifurcation of a slot only affects that slot.
8x4x4 means that the 16 lanes will be split into one 8x and two 4x lanes.
To make use of this, you need some form of an adapter, or a PCIe card with separate devices on board.
An adapter example is a 16x adapter that gives you two 8x slots.
A card example is a 16x card with four m.2 slots onboard, each using 4 lanes.
If you were to use such an adapter on a slot that does 8x4x4x, you won't be able to use all 4 m.2 slots because one of them won't be independent. You'll end up using m.2 slot 0 (using 4 lanes out of 8), and then slots 2 and 3 (4 lanes each). You won't be able to use slot 1 because that will be wired to second half of the 8 lanes that are not independent.
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Posted By: meekrophone
Date Posted: 04 Apr 2023 at 12:26am
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Thanks for the explanation, appreciate it.
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