Hi, thanks, I´m aware that changing the video card is one part of the problem. Wich RX580 do you like the most, I've been looking and they all are more around the same price range. Personally I like the Gigabyte Aorus RX580 and the MSI RX Armor. The XFX is a brand that I normally don't care much about.
On the other hand, my motherboard is a Z390 Gaming Sli from Gigabyte, and acording to them in their specs he ethernet card is the Intel® GbE LAN chip (10/100/1000 Mbit).
Intel Z390 GAMING Motherboard with 10+2 Digital PWM Design, ALC1220-VB, 2-Way SLI™ / 2-Way CrossFire™ Multi-Graphics, USB 3.1 Gen2 Type-A, M.2 Thermal Guard...
www.gigabyte.com
.
It's not very clear what piece of hardware they are using so I looked up inside intel for a linux driver, and I found this website:
Installation and configuration details for the Linux* Base Driver for Intel® Gigabit Ethernet Controllers
www.intel.com
But it is still not clear wich one it is. Moreover, it is a linux driver, I really have no idea how to get the proper driver (kext) for the mojave version. Do you know how?
Thanks again!