https://forum.asrock.com/ Copyright (c) 2006-2013 Web Wiz Forums - All Rights Reserved. Mon, 13 Apr 2026 01:41:19 +0000 Wed, 25 Jun 2025 04:06:35 +0000 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 12.04 360 https://forum.asrock.com/RSS_post_feed.asp?TID=111491 https://forum.asrock.com/forum_images/web_wiz_forums_black.png https://forum.asrock.com/ https://forum.asrock.com/forum_posts.asp?TID=111491&PID=197809&title=x870e-taichi-pcie-slot-bifurcation#197809 Author: Dr_KrillE
Subject: 111491
Posted: 25 Jun 2025 at 4:06am

I've tried with two graphics card and get x8 on both slots (with both slots occupied) so just put your graphics card in the bottom slot and whatever x4x4/x8 in the top.
Mobo Asrock X870E Taichi

//Dr.
]]> Wed, 25 Jun 2025 04:06:35 +0000 https://forum.asrock.com/forum_posts.asp?TID=111491&PID=197809&title=x870e-taichi-pcie-slot-bifurcation#197809 https://forum.asrock.com/forum_posts.asp?TID=111491&PID=197746&title=x870e-taichi-pcie-slot-bifurcation#197746 Author: NDRE28
Subject: 111491
Posted: 23 Jun 2025 at 9:37pm

Yeah.
I agree. ]]> Mon, 23 Jun 2025 21:37:23 +0000 https://forum.asrock.com/forum_posts.asp?TID=111491&PID=197746&title=x870e-taichi-pcie-slot-bifurcation#197746 https://forum.asrock.com/forum_posts.asp?TID=111491&PID=197716&title=x870e-taichi-pcie-slot-bifurcation#197716 Author: Lady Fitzgerald
Subject: 111491
Posted: 22 Jun 2025 at 6:39pm

NDRE28 wrote: Hi! I own the ASRock X670E Taichi. I have the same bifurcation options as you do. I've tested all of the bifurcation options. Unfortunately, x8/x4/x4 means that your bottom PCIe slot will run in x8 mode, while your top slot will run in x4/x4 mode! ASRock should create the x4/x4/x8 mode too! But, so far, they didn't.

Thank you for your intelligent reply!

It's a shame ASRock has such poor documentation for the BIOS of what should be an excellent MOBO, especially since the BIOS has so many options. And it seems stupid for the bifurcation be x4x4x8 (even more so since the documentation claims x8x4x4) when the graphics card has to be mounted in the top slot because it would block access to the headers on the bottom of the MOBO if it was installed in the bottom slot. ]]> Sun, 22 Jun 2025 18:39:46 +0000 https://forum.asrock.com/forum_posts.asp?TID=111491&PID=197716&title=x870e-taichi-pcie-slot-bifurcation#197716 https://forum.asrock.com/forum_posts.asp?TID=111491&PID=197714&title=x870e-taichi-pcie-slot-bifurcation#197714 Author: NDRE28
Subject: 111491
Posted: 22 Jun 2025 at 12:42pm

Hi!

I own the ASRock X670E Taichi.
I have the same bifurcation options as you do.

I've tested all of the bifurcation options.
Unfortunately, x8/x4/x4 means that your bottom PCIe slot will run in x8 mode, while your top slot will run in x4/x4 mode!

ASRock should create the x4/x4/x8 mode too!
But, so far, they didn't.

]]> Sun, 22 Jun 2025 12:42:39 +0000 https://forum.asrock.com/forum_posts.asp?TID=111491&PID=197714&title=x870e-taichi-pcie-slot-bifurcation#197714 https://forum.asrock.com/forum_posts.asp?TID=111491&PID=197681&title=x870e-taichi-pcie-slot-bifurcation#197681 Author: M440
Subject: 111491
Posted: 21 Jun 2025 at 5:44pm

Lady Fitzgerald wrote: Let me rephrase my first question. In the BIOS (UEFI) manual, it shows configuration options [Auto] [x8x8] [x8x4x4] [x4x4x4x4]. If I have a graphics card in the top slot and a card for two SSDs in the bottom slot and I chose the x8x4x4 option, would I get x8 in the top slot and x4x4 in the bottom slot?

thats what the logic suggest,

otherwise this motherboard with built in $11.5 bifurcation adapter would make no sense, but you never know]]> Sat, 21 Jun 2025 17:44:03 +0000 https://forum.asrock.com/forum_posts.asp?TID=111491&PID=197681&title=x870e-taichi-pcie-slot-bifurcation#197681 https://forum.asrock.com/forum_posts.asp?TID=111491&PID=197629&title=x870e-taichi-pcie-slot-bifurcation#197629 Author: Lady Fitzgerald
Subject: 111491
Posted: 21 Jun 2025 at 1:55pm

Let me rephrase my first question. In the BIOS (UEFI) manual, it shows configuration options [Auto] [x8x8] [x8x4x4] [x4x4x4x4]. If I have a graphics card in the top slot and a card for two SSDs in the bottom slot and I chose the x8x4x4 option, would I get x8 in the top slot and x4x4 in the bottom slot? It's not clear in the manual if the configuration options are for both slots or only the top one.]]> Sat, 21 Jun 2025 13:55:21 +0000 https://forum.asrock.com/forum_posts.asp?TID=111491&PID=197629&title=x870e-taichi-pcie-slot-bifurcation#197629 https://forum.asrock.com/forum_posts.asp?TID=111491&PID=197378&title=x870e-taichi-pcie-slot-bifurcation#197378 Author: Lady Fitzgerald
Subject: 111491
Posted: 19 Jun 2025 at 11:58am

bump]]> Thu, 19 Jun 2025 11:58:08 +0000 https://forum.asrock.com/forum_posts.asp?TID=111491&PID=197378&title=x870e-taichi-pcie-slot-bifurcation#197378 https://forum.asrock.com/forum_posts.asp?TID=111491&PID=196462&title=x870e-taichi-pcie-slot-bifurcation#196462 Author: Lady Fitzgerald
Subject: 111491
Posted: 14 Jun 2025 at 8:49am

I know the board has only two PCIe slots; I said I have one.

I also know that 8x4x4 will give me what I want for lane allocation. My first question was is this MOBO capable of that? The information I'm getting from the manuals is contradictory.]]> Sat, 14 Jun 2025 08:49:38 +0000 https://forum.asrock.com/forum_posts.asp?TID=111491&PID=196462&title=x870e-taichi-pcie-slot-bifurcation#196462 https://forum.asrock.com/forum_posts.asp?TID=111491&PID=196461&title=x870e-taichi-pcie-slot-bifurcation#196461 Author: eccential
Subject: 111491
Posted: 14 Jun 2025 at 8:05am

The board only has two PCIe slots, so I assume x8x4x4 will give you what you want (top slot at x8 and bottom slot at x4x4).
]]> Sat, 14 Jun 2025 08:05:22 +0000 https://forum.asrock.com/forum_posts.asp?TID=111491&PID=196461&title=x870e-taichi-pcie-slot-bifurcation#196461 https://forum.asrock.com/forum_posts.asp?TID=111491&PID=196456&title=x870e-taichi-pcie-slot-bifurcation#196456 Author: Lady Fitzgerald
Subject: 111491
Posted: 14 Jun 2025 at 5:49am

BTW, I'll be running Linux Mint 21.1 Cinnamon on it.]]> Sat, 14 Jun 2025 05:49:18 +0000 https://forum.asrock.com/forum_posts.asp?TID=111491&PID=196456&title=x870e-taichi-pcie-slot-bifurcation#196456