OWC Flex 1U4 PCIe Ethernet Card Not Available to MacStudio

I'm using a MacStudio M1 Ultra with macOS 12.4 installed and connected to an OWC Flex 1U4 RAID enclosure. The 1U4 has an OWC 10G ethernet card installed in its internal PCIe slot. The Mac sees that there is an ethernet card on the PCI bus, but shows no driver loaded.

I've spoken with OWC support and they are investigating because they say no driver is needed for this card with macOS 12.4.

I'm curious if anyone else out there is running this drive enclosure with an ethernet card and if it is working for them.

The system is running in reduced security (needed for the OWC SoftRAID software to work).

If I remove the card, the ethernet entry above goes away. In network prefernces there is no entry for this ethernet card, so I can't add or delete/modify there.

Mac Studio

Posted on Jul 12, 2022 2:11 AM

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4 replies

Jul 17, 2022 8:10 AM in response to David Stempnakowski

David Stempnakowski wrote:

I'm using a MacStudio M1 Ultra with macOS 12.4 installed and connected to an OWC Flex 1U4 RAID enclosure. The 1U4 has an OWC 10G ethernet card installed in its internal PCIe slot. The Mac sees that there is an ethernet card on the PCI bus, but shows no driver loaded.
I've spoken with OWC support and they are investigating because they say no driver is needed for this card with macOS 12.4.
I'm curious if anyone else out there is running this drive enclosure with an ethernet card and if it is working for them.
The system is running in reduced security (needed for the OWC SoftRAID software to work).

https://discussions.apple.com/content/attachment/9098151d-092e-4d99-8b8f-ff56699248d6
If I remove the card, the ethernet entry above goes away. In network prefernces there is no entry for this ethernet card, so I can't add or delete/modify there.


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Aug 24, 2022 6:38 AM in response to David Stempnakowski

After a few weeks of OWC support looking into this, I finally received an answer. The short of it is that no, a Mac Studio will not work with certain 10Gb PCIe Ethernet cards in a 1U4.


"Thank you for being so patient. It appears that when connected to a Mac Studio, PCIe network cards with Marvell AQCxxxx chipsets are not supported inside the Flex1U4. A daisy chained Thunderbolt to 10G adapter or mounting the PCIe card in a Helios 3S may be alternatives. "

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OWC Flex 1U4 PCIe Ethernet Card Not Available to MacStudio

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