AMD Motherboards - 8x8x PCIe Bifurcation Support for Taichi X399

Print Page | Close Window

8x8x PCIe Bifurcation Support for Taichi X399

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=10992
Printed Date: 27 Jul 2025 at 6:51am
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com

Topic: 8x8x PCIe Bifurcation Support for Taichi X399

Posted By: jhsu
Subject: 8x8x PCIe Bifurcation Support for Taichi X399
Date Posted: 01 Mar 2019 at 7:19am

On my Taichi X399 I only see an option for x4x4x4x4 mode in the bios for splitting the x16 pcie slot, but I would like to attach 2 gpu's at x8 each using a splitter like this:
http://www.ameri-rack.com/ARC2-PELY423-C7_m.html

Is this something that could be added as a feature request in the next bios update?

It seems a waste to have all these pcie lanes on a Threadripper system, but then the motherboard's bios not supporting bifurcation in a useful way.