So I recently just bought a pc from a friend and it plays decent games like civ 5 and ksp but when I try to play say rainbow 6 seige I have to turn the graphics low and my computer still is loud I want to upgrade my specs but I'm new to pc gaming and don't know if purchasing a new graphics card will require me to upgrade other things what should I do? CPU:Intel Core i5-3450 GPU: Nvidia GTX 480 and i think 6 GB of ram