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U.2 used as pcie x 4? |
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jordanmw 
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Joined: 31 Oct 2018 Status: Offline Points: 6 |
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 Topic: U.2 used as pcie x 4?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 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 |
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jordanmw
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Joined: 31 Oct 2018 Status: Offline Points: 6 |
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Posted: 31 Oct 2018 at 11:21pm |
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dilacerated
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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: |
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jordanmw
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Posted: 06 Nov 2018 at 4:40am |
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I've contacted them- still no response....
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scythefwd
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Posted: 06 Nov 2018 at 10:15am |
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threadripper 1950x at 3.9ghz
32gb gskill tridentz 3200 @3333 samsung 850 evo CM 1k watt psu Enermax tr240 cooler s340 case |
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jordanmw
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Posted: 13 Nov 2018 at 8:36am |
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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.
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rbrowning
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Posted: 3 hours 40 minutes ago 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. |
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jordanmw wrote: