Bad FPS despite a good PC?

Al
7

Today my new graphics card arrived (Asus Radeon rx570 8gb) and now I play with less FPS than before (Minecraft before ~ 150 / now 30-50) Does anyone know why?

Other PC data

i7 3770K, 16gb ddr3 ram the rest is not so important i think right?

Ru

Old graphics card?

and it may be that the settings are automatically higher

Me

Before installing the new GPU, uninstall the old drivers.

Install the new drivers only after installing the new GPU.

If necessary, reinstall the games as they are often fixed to the old GPU.

Al

All right, I didn't do that, how does that work?

Je

What was previously installed for a graphics card?
Times thoroughly uninstall all graphics drivers. Then download and install the latest and most suitable version from the website.

Al

All right, I didn't do that, how does that work?

Me

Start driver exe and press uninstall instead of install.

Al

Before, an amd Radeon HD 6870 was installed and I have now made it, but it's still the same.