You have no worries with this config. The XFX Radeon R9 280X 3GB is an amazing GPU, it will run games perfect and mostly every game on High or Ultra settings (Depending on the in-game settings, but you will be able to run any game at maximum).
The CPU itself is good too, I mean... The i5 is the best you can get for gaming, but it is a i5-4440, non-K.
When it has a "K" on the end, it means it is able to overclock it. If you are not into OC, then that CPU will do amazing as well without any OC
You have a nice configuration there, good luck and have loads of fun with it