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Problem with USB-C PCIe card

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Hi all,


I have the following problem with this configuration:

OS High Sierra 10.13.6

Board: Gigabyte H370M DS3H

Processor:  i5 8400

Graphics card: GeForce GTX 1050

PCIe USB-C card: Sonnet Allegro USB-C 4-Port PCIe Card

PCIe FW800 card: DIGITUS, PCIe, Firewire 800


The system works fine as long as no usb-c drive is connected to the allegro. A USB-C drive connected to the boards usb-c is causing no problem.


If i connect a usb-c drive to the allegro the following happens:

- Drive Icons stay on the desktop, even if a drive is not connected, happens to all drive type (fw800, usb, usb-c)

- finder freezes if you try to unmount a drive


I tried a different USB-C card (BEYIMEI PCI-Express 4X zu USB 3.1 Gen 2 (10 Gbit/s) 2-Port, Asmedia-Chipset) with the same effect.


Does anybody have a suggestion why this is happening and how to resolve it?




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the cpu can use 16 lanes pcie

the 1050 uses 16 lanes, the fw800 2 lanes, the usb-c 4 lanes.


is it possible that the problem is here?

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I've put the card into my Catalina Hackintosh, it is not recognized at all. No drive is shown.


Is there any special entry in the plist to get usb-c card running in Catalina or high sierra?

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