Those are well matched parts. Every system has a limit somewhere or it would run a bazillion FPS at the speed of light.
What are you using the system for and if gaming, what games?
Some games load the CPU heavily and will struggle on nearly anything (DayZ). If you are trying for 4k or multi-monitor 2K the GPU will limit you.
For 1080p, 60Hz, those are decent parts.
Until we know what you are using the system for and what aspect of it needs to be better we cannot answer your question with any precision.