It’d help to know what motherboard you’ve got currently. CPU-Z (or CPU-X if you’re on Linux already) can give you that information.

AMD I find to be the best of out of the box Linux support. What are your use cases? Gaming, web browsing, etc.

As for your power supply, you should be able to find a model number on it to see if it’d support the new card. Some new cards require newer connectors (though adapters are available). The other consideration is power output. Can it supply enough power to the new card along side your other components. There’s a power supply calculator you can use to see if the demand will exceed the supply.