I'll check that motherboard out. That's what you're running, right? The AsRock Rack X570D4U? Sounds pretty reasonable, actually. I'm torn between getting a new card and getting a new motherboard now.

Edit: is this a comparable board to your recommendation? Couldn't find an identical model on Amazon.

https://www.amazon.com/Mini-ITX-Motherboard-Generation-Processors-X570D4I-2T/dp/B08FBNPVNC/ref=sr_1_7?crid=2XOHR51ZEDPEO&dchild=1&keywords=asrock+rack+x570d4u&qid=1611566487&sprefix=AsRock+Rack+X570D4U%2Caps%2C1400&sr=8-7

Edit #2: I checked out that motherboard a bit more, and it's more expensive than my current motherboard was on Newegg. I'm thinking I might just give one of these NIC // cards a shot.