I am trying to purchase a 4 port Gigabit Ethernet PCIE Card for our new Mac Pro, is there a specific model or brand that is supported by Mac OS Catalina on the Mac Pro? I cannot find anything that explicitly mentions Mac support.
Many thanks in advance
Most ordinary Gigabit Ethernet cards have been discontinued.
The readily-available ones with Mac support tend to be Fiber-optic SFP+ interface and (up to) 10G speeds.
sonnet tech makes a couple, but their highest is two ports:
https://www.sonnettech.com/product/networking/ethernet-networking.html
OWC sells one affordable one and several that have more than one port and fiber-optic interface, at heart-stopping prices:
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It has two built-in ports that can do 10G Ethernet-over-copper.
What are you doing that needs more? That should be a job for a 10G Ethernet Switch.
Yes indeed, I am running several networks which I would prefer to separate, Audio over IP (Dante) A mixing desk controller protocol, Shared Storage and house network. Two of these will run off of the 10G ports but I would prefer to divide the remaining interfaces up by port rather than configure a switch.
After a bit more looking around, I was surprised to discover that there are some *SFP+ interface modules available for RJ45 copper cabling.
This could mean starting with an SFP+ card with an RJ45 copper module, then possibly upgrading later to a fiber-optic module when its time for a fiber-optic cabling upgrade.
It could also means starting with a 10G Switch with SFP+ for its network port, but using an RJ45 copper interface for now, then upgrading later to fiber-optic backbone.
Mac Pro Ethernet Card
