But I think what you really wanted to ask is what GPU is most balanced with your CPU.
However, that is the wrong question to ask.
The question is: what GPU is best for the monitor I have, the games I want to play, and with the CPU I currently have?
The reason for that is because there is no harm in getting a GPU that is more than your CPU can keep up with. It will not ever make performance WORSE than it would be with a lesser GPU.
So, we need to know:
What games do you want to play?
What are your performance expectations on those games (frame rate, detail settings, etc)
What is your monitor's resolution?
What is your monitor's refresh rate?
Does your monitor have FreeSync, GSync, or neither?
If FreeSync, what is the FreeSync range?
If you don't know the details of your monitor, the exact brand and model of your monitor would be helpful.
What is the exact brand and model of your Power Supply?