The i5-5200U is an excellent CPU, if you want to conserve battery power and surf the web. Its a poor choice for gaming as it is not optimized for raw performance that games need. It is also a dual core CPU if I'm not mistaken, where GTA clearly works best with 4 or even more cores.
The 830m is 2 generations old very entry level graphics card. Its not much better if at all then the integrated GPU that comes with the i5-5200U. It is not suitable for much more then casual low resolution gaming on older games.