Ahem.
The i5-4590 is a good chip. I speak from experience because that's what in my system right now.
The 750 Ti will run games on Ultra at 1080p. But it will not get you 60FPS. You will probably see framerates more in the range of 20-30. For 60FPS you will have to drop most games down to medium settings. I know this, because I have a 750 Ti too (and at one point had it paired with my i5-4590).
You will want to get a better graphics card. The 750 Ti is my fallback card in case my 1070 dies on me. But I would not use it for a daily driver.