Thanks JorgeB. Unfortunately I only have one slot to play with
But based on a few other threads, I ended up ordering this from ebay https://www.ebay.ca/itm/234688389592 and it just arrived and it works.
This was plug an play as all I did was turn unraid off. Install new NIC and move ethernet cable from mother board port to new NIC. Start unraid and i can log in.
As for the Asus, I'll install it on my windows machine again and test out and see how reliable it is.
Appreciate the time and help. Thanks again.