Don't. There is only a very minor difference. I am still still running a 3770 non k (had 3470 before) paired with 2060 (1060 before) and I am severely CPU bottlenecked. Just get a 5600X or the Intel equivalent, it is time to move on. ;) If you really cannot afford a platform change, something in the neighborhood of 570/580 or 1060/1650s is fine.