Support for this NIC is apparently not planned (Thanks Intel!):
https://jira.ixsystems.com/browse/NAS-107244
It's kinda frustrating because this is the second mainboard+cpu+ram that I bought (If someone in Switzerland wants the old one you can pick it up incl. CPU and RAM. For 50 CHF. It was used for about 10 hours).
I need 3 PCIe x2 slots for the SATA controllers because the case is for 24 SATA drives (each controller has 8 ports). The first board could only utilize two PCIe slots of the 3 that are longer than x1 for some reason, and I didn't want to saw off the end of one of the x1 slots to fit one of the cards in.
This new board now seems to recognize all disks (tested with gparted, all 24 show up) but now the network is not functioning.
The last time I built a computer was when PCIe was just arriving and boards would still have more PCI than PCIe slots, so my knowledge is a bit out of date.
This leads me to the question, are there PCIe x1 NIC or USB3 NIC that work with this OS?
I found this one which supposedly works (Intel 82574L chip from 2008), but it's for PCIe version 1.1. I'm not sure if this degrades the version of the SATA cards down to 1.1 too.
In case it's important, this device will be used by me only and is mostly for bulk storage and retrieval of media files.