I got an Rx 5700 xt a few days ago (Sapphire Pulse, Ryzen 5 2600) and in Fortnite on the low settings I didn't even get 200 FPS and very often drops to 40 FPS which is worse than my old graphics card (GTX 1050ti)
Does somebody has any idea
Fortnite is hardly graphically demanding, especially not on low.
You have not less fps than with the 1050ti, but exactly the same, because yesterday as today you are in the CPU limit. You can also punch in 2 * 2080ti and have identical fps…
Want to overclock my CPU
With the 2600 you will surely get 4.1-4.2GHz stable. That will bring something.
Unfortunately, the 2600 isn't necessarily the best CPU for Fortnite. The game basically uses only two cores and actually only uses the main thread intensively, so it is not really suitable for modern processors. High clock (core i) or at least a high IPC (Matisse) bring good frames.