ASRock Forums : U.2 used as pcie x 4? https://forum.asrock.com/ Copyright (c) 2006-2013 Web Wiz Forums - All Rights Reserved. Sun, 12 Apr 2026 22:07:27 +0000 Thu, 23 Jan 2025 03:49:30 +0000 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 12.04 360 https://forum.asrock.com/RSS_post_feed.asp?TID=10041 <![CDATA[ASRock Forums]]> https://forum.asrock.com/forum_images/web_wiz_forums_black.png https://forum.asrock.com/ <![CDATA[U.2 used as pcie x 4? : jordanmw wrote:got new cable...]]> https://forum.asrock.com/forum_posts.asp?TID=10041&PID=176060&title=u-2-used-as-pcie-x-4#176060 Author: rbrowning
Subject: 10041
Posted: 23 Jan 2025 at 3:49am

Originally posted by jordanmw jordanmw wrote:

got new cable and adapter- now using 8639 to 8643- made no difference.? Doesn't recognize the card.? I really think the U.2 is not enabled.? This should be a non issue.


I recently purchased a x399 motherboard. I am also looking to use the U.2 port to connect to my SSDs rather than having to use an HBA card. However, I am encountering the same error. The motherboard doesnt recognize the drives when they are plugged in via a mini-sas connector. ]]> Thu, 23 Jan 2025 03:49:30 +0000 https://forum.asrock.com/forum_posts.asp?TID=10041&PID=176060&title=u-2-used-as-pcie-x-4#176060 <![CDATA[U.2 used as pcie x 4? : got new cable and adapter- now...]]> https://forum.asrock.com/forum_posts.asp?TID=10041&PID=57770&title=u-2-used-as-pcie-x-4#57770 Author: jordanmw
Subject: 10041
Posted: 13 Nov 2018 at 8:36am

got new cable and adapter- now using 8639 to 8643- made no difference.  Doesn't recognize the card.  I really think the U.2 is not enabled.  This should be a non issue.]]> Tue, 13 Nov 2018 08:36:40 +0000 https://forum.asrock.com/forum_posts.asp?TID=10041&PID=57770&title=u-2-used-as-pcie-x-4#57770 <![CDATA[U.2 used as pcie x 4? : isnt u.2 also known as sff8639?...]]> https://forum.asrock.com/forum_posts.asp?TID=10041&PID=57624&title=u-2-used-as-pcie-x-4#57624 Author: scythefwd
Subject: 10041
Posted: 06 Nov 2018 at 10:15am

isnt u.2 also known as sff8639?  Those 8643 minisas cables probably arent pin compatible...]]> Tue, 06 Nov 2018 10:15:51 +0000 https://forum.asrock.com/forum_posts.asp?TID=10041&PID=57624&title=u-2-used-as-pcie-x-4#57624 <![CDATA[U.2 used as pcie x 4? : I&#039;ve contacted them- still...]]> https://forum.asrock.com/forum_posts.asp?TID=10041&PID=57613&title=u-2-used-as-pcie-x-4#57613 Author: jordanmw
Subject: 10041
Posted: 06 Nov 2018 at 4:40am

I've contacted them- still no response....]]> Tue, 06 Nov 2018 04:40:58 +0000 https://forum.asrock.com/forum_posts.asp?TID=10041&PID=57613&title=u-2-used-as-pcie-x-4#57613 <![CDATA[U.2 used as pcie x 4? : Was casually flying through here...]]> https://forum.asrock.com/forum_posts.asp?TID=10041&PID=57505&title=u-2-used-as-pcie-x-4#57505 Author: dilacerated
Subject: 10041
Posted: 01 Nov 2018 at 1:39pm

Was casually flying through here and this post caught my eye.

This is a community forum seldom traveled by ASRock's Technical Support staff.  You need to contact them via their web form for this:

https://event.asrock.com/tsd.asp
]]> Thu, 01 Nov 2018 13:39:33 +0000 https://forum.asrock.com/forum_posts.asp?TID=10041&PID=57505&title=u-2-used-as-pcie-x-4#57505 <![CDATA[U.2 used as pcie x 4? : Hello? Anyone try this? Can...]]> https://forum.asrock.com/forum_posts.asp?TID=10041&PID=57492&title=u-2-used-as-pcie-x-4#57492 Author: jordanmw
Subject: 10041
Posted: 31 Oct 2018 at 11:21pm

Hello? Anyone try this?  Can you help me Asrock?]]> Wed, 31 Oct 2018 23:21:21 +0000 https://forum.asrock.com/forum_posts.asp?TID=10041&PID=57492&title=u-2-used-as-pcie-x-4#57492 <![CDATA[U.2 used as pcie x 4? : I have the adapter listed below...]]> https://forum.asrock.com/forum_posts.asp?TID=10041&PID=57475&title=u-2-used-as-pcie-x-4#57475 Author: jordanmw
Subject: 10041
Posted: 31 Oct 2018 at 5:01am

I have the adapter listed below with the cable below that.  I have an asrock taichi x399 which mentions that the M.2_2 slot will be disabled if you use the U.2 connector.  I don't have anything in any of my M.2 slots- but am still not seeing the card in unraid or windows if I have it connected that way.  I do have the additional power connected to the adapter and do see things power up if I plug in a usb peripheral but the device is not recognized.  I am also not seeing any options in the bios to enable or manage the U.2 settings. 

I have all 4 PCIE x 16 slots filled with GPUs, but from what I can tell, I should have the spare pcie lanes to use the U.2 connector to go to an adapter for pcie x4 and have it recognize it with no issues. 

 

Adapter: https://www.amazon.com/Mini-SFF-8643-PCI-Lanes-Adapter/dp/B01DV7LF02

Cable: https://www.microsatacables.com/mini-sas-hd-sff-8643-to-sff-8643-cable-50-cm

 

Can someone at asrock at least confirm that even with all the x16 slots populated, the U.2 should still be enabled?  Maybe point me to somewhere in the bios that controls if the U.2 port is enabled?  Please help!

I am trying to get a Sonnet Allegro pro to work over the U.2 port with an adapter to pcie x4...... 

 

The hardware:

Corsair 740 Air case

Asrock Taichi X399

Threadripper 1920X

Corsair 64Gb 8x8Gb 2933Mhz

Evga CLC 280

Evga 1Kw gold PSU

4x Evga GTX 960 SSC 4Gb (had them already- probably upgrade to 2XXX series eventually)

2x Plextor 512Gb SSD

2x WD purple 3Tb

]]> Wed, 31 Oct 2018 05:01:33 +0000 https://forum.asrock.com/forum_posts.asp?TID=10041&PID=57475&title=u-2-used-as-pcie-x-4#57475