Also,
Putting a single 10gig interface on a 4x PCIe card seems like a waste of PCIe lanes.
A single PCIe Gen 4 lane should be able to fully support 10gig Ethernet bandwidth.
Heck, a single Gen3 lane could even support ~7880 Mbit/s, and depending on whats on the other end of that connection, you may never hit 7880 Mbit/s anyway.
Maxing out fast Ethernet standards can be harder than it seems.
I've only been able to max out 10gig relatively recently. When I first got a 10gig NIC back in ~2014 (used brocade BR-1020's), even in a direct connection between a high end server and desktop, I rarely saw more than 3000 to 4000 Mbit/s.
Still can't max out 40gig (though I do get well above 10gig bandwidth)
Those of us who know what we are doing could totally max out 10gig Ethernet, but for most people, running it on 1x Gen3 would likely be more than enough to both exceed multigig performance, and provide more than enough performance.