Hold your expectations w/ the R5 2600. A 4.2Ghz overclock is possible, but 4.3 and 4.4 are much more difficult. This because the amout of voltage is insane and you dont wnat to run 1.5v on a 12nm processor on a daily basis.
In the end, a 4.2 R5 2600 flyes and can handle fast GPU´s @ 1080p easy.
If paired w/ mid GPU´s like RX580 or GTX1060 runs great !
As some people sayd, if you plan stock clock´s go R5 2600X, if you want to overclock get the R5 2600 and a good cooler !
Some 16GB @ 3200 RAM is a must !
Good Luck !
R5 2600 - MSI X470 Gaming Pro - nVIDIA GTX1060 6GB O.C - Corsair Vengeance LPX 16GB @ 3200 - Cooler Master Storm Scout - Western Digital Green 240GB M.2 - Kyngston A400 480GB - Seagate Barracuda 1Tb - Cooler Master Hyper 212 Turbo - SamSung 32in LED - eVGA 750W - Razer Abyssus V2 - Logitech G27