Well I can't find what your GPU is but I what I did find it has a HD 5470 in all the other Ri5 models. But the problem is that you cannot upgrade a GPU in a laptop unless it is high end gaming laptop.
Yours isn't. The only thing you can upgrade is the RAM. So I have never herd of a intel i5 gcard. So I can't tell you if that would be sufficient or not. Sorry I have to tell you this stuff. Good luck to you and I hope your GPU will do what you want it to do.