Cheap GPU for the display to work alongside a GeForce RTX 2060

System:
Ubuntu 18.04 (20.04)
GeForce RTX 2060

Can someone suggest a cheap Nvidia GPU with a DVI connection to run a 2560 x 1440 display, that can work alongside a GeForce RTX 2060 doing dedicated deep learning? I’m unsure on how recent I need to get and how expensive in order for the drivers of the 2 cards to play nice together (which my old GTX 2060’s don’t seem to do with the RTX 2060 ?)
Thanks