Computer Having less FPS in all games

[Echo.]

Hello there,

I think it's time for me to encounter few problems with my PC.

First of all, there are my specs :

RTX 2080 EXOC Gigabyte, 8Gb GDDR6
i5 9600K ~ 4.8GHz for 1.36 Voltage Ratio
16Gb ram ddr4 @2666MHz
Disk : Optane m.2 NVME, + 2 HDD 1000GB + 1 SSD 240GB

When I built the computer, FPS went to be great. Around 80/90FPS on BFV (Ultra settings), more than 1200 FPS on Minecraft, etc;

I had to reinstall Windows. I just installed drivers; Tried out another time performances, I usually turn at 60fps now on BFV Ultra, around 800 FPS in Minecraft.

What can cause such lower performances ?

Thanks,


Echo.