You already have those parts? If I were you I would stick with what you have for a while, and then eventually upgrade to get another one once it is hard to run games on high/ ultra (whichever you care about). There is also the factor that a lot of games the ultra setting is designed for higher than 1080p resolution. In metro 2033 I literally can tell no difference between ultra and high settings on my 1080p screen. for reference 60fps is the max fps you need, anything higher than that doesn't matter.