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Hello PvP, thanks for joining the Intel Community.
I would like to inform you that the processor you are using is not causing the performance issue on your system since once you installed a video card on the board, it automatically disable the onboard video.
The I7-4790U is a really good processor. It comes with Intel® HD Graphics 4600, have you tried playing the game without using a video card?
Regarding a better graphics card, I would recommend you on waiting for a reply from another user. The best option for you, would depend on your budget.