The CPU already is top. Even an i5 does fine for most games, so an i7 tends to be overkill. And you have enough RAM also. http://www.notebookcheck.net/AMD-Radeon-R9-M290X.108643.0.html makes me think it's a quite capable graphic card also, so I'd suggest you just start and see how it works.
I recently bought a laptop (not for gaming). Its a pretty good one from what i can tell, but i actually never used it for gaming. Now i want to play some games such as the Witcher 3 or GTA V.
I think i would be able to play them only my CPU needs to be upgraded. Am I right?
-AMD Radeon R9 M290X
-Intel Core i7-4710MQ CPU @ 2.50GHz
If im right, what would you suggest to upgrade?
Thanks in advance,