U.2 used as pcie x 4?
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=10041
Printed Date: 23 Jan 2025 at 10:26am
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com
Topic: U.2 used as pcie x 4?
Posted By: jordanmw
Subject: U.2 used as pcie x 4?
Date Posted: 31 Oct 2018 at 5:01am
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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%3ctag=linus21-20" rel="nofollow - - 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 |
Replies:
Posted By: jordanmw
Date Posted: 31 Oct 2018 at 11:21pm
| " rel="nofollow - Hello? Anyone try this? Can you help me Asrock? |
Posted By: dilacerated
Date Posted: 01 Nov 2018 at 1:39pm
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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" rel="nofollow - https://event.asrock.com/tsd.asp
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Posted By: jordanmw
Date Posted: 06 Nov 2018 at 4:40am
| I've contacted them- still no response.... |
Posted By: scythefwd
Date Posted: 06 Nov 2018 at 10:15am
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" rel="nofollow - isnt u.2 also known as sff8639? Those 8643 minisas cables probably arent pin compatible... ------------- threadripper 1950x at 3.9ghz 32gb gskill tridentz 3200 @3333 samsung 850 evo CM 1k watt psu Enermax tr240 cooler s340 case |
Posted By: jordanmw
Date 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. |
Posted By: rbrowning
Date Posted: 23 Jan 2025 at 3:49am
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. |
jordanmw wrote: