Are you running the latest drivers ?
I have absolutely no problem using Nvidia cards, I currently have a gtx670, gtx1060 and a rtx2070 running.
Drivers are super stable, way better than AMD and Intel.
That said Nvidia uses a very high priority for the card, something that the manufacturer bake into the card.
However something like outdated or generic chipset drivers for your motherboard, can really make this a nightmare.
Or said in a different way, everything else has to be up to date and working correctly, then there is a good chance your system will perform well even with a Nvidia card.
Sorry it just triggers me to see Nvidia cards described as BAD, when in fact they are the best on the market including drivers.
I’m not saying AMD cards are BAD, and the issues the drivers have would probably not be an issue for you, if you only are running Cubase all day long.
Now I feel better