Small pc problems?

I recently bought this pc: https://krotus-computer.de/gamer-pc/high-end-gamer-pcs/8/enthusiast-gaming-pc-amd#b7f3084483702d9e9b53057b33724f55

I'm quite satisfied with this but I have the feeling that he loses power very quickly. When I played The Witcher 3 for the first time I had 144 FPS constant but only 100-130 backside but also fall to 60-80 this is not bad but I find it very strange even if I played fortnite games at the beginning of 300 and now sometimes as 100-150 fps, the graphics card in Overwatch reaches 70 degrees on ultra setting! In overwatch it is then constant 150 FPS

All drivers currently?

70 degrees are still in the normal range for a graphics card

OK thanks

How can I update the drivers?

Open Geforce Experience and there you will find it.

If it is an Nvidia card, this can be done here:

https://www.nvidia.de/...lts/139950