Which game in particular? I would say definitely, the GTX 980 is a very powerful GPU, while the FX 6300 is a decent CPU, its single core performance, which is very important in gaming, is quite weak. To get the most out of that GTX 980, you might want to get a CPU with better single threaded performance, such as an Intel Core i5 (Sandy Bridge i5s are still excellent choices on a budget), or even a newer AMD Ryzen. If you are REALLY on a budget, you can overclock your CPU if your motherboard supports it, or look into upgrading to something like an FX 8320, which has 2 more cores. That being said, I would imagine that even at half usage, gaming performance should still be decent.